Montessori Basics: The Planes of Development
Rebecca Lingo • May 20, 2024

Observing the growth and development of your children at Wheaton Montessori School, and home, can be better understood and articulated when viewed through the lens of Dr. Maria Montessori's concept of The Planes of Development. This concept offers a comprehensive framework that outlines the stages of a child's development from birth to adulthood. Each stage, or plane, is characterized by specific developmental traits and needs, providing parents with a roadmap of sorts to better navigate the journey of their child's growth.


Montessori Basics: The Planes of Development


Dr. Maria Montessori based her entire educational philosophy on the idea that children developed through a series of four planes. Each of these planes is easy to recognize and has clear, defining characteristics. If we study and understand these stages, we can approach our interactions with children with a new perspective.  


Learning about the planes of development isn’t just for Montessori educators. Understanding your child’s development can help at home, too.  


The First Plane: Birth-6 years


During this stage, children absorb everything like sponges. They are, indeed, excellent examples of what Montessori called ‘The Absorbent Mind.’ This is a time in which we can utilize what Montessori called sensitive periods of learning. While each child is different, there are typical patterns that emerge with brain development and general readiness to learn particular skills. 


During the first three years of this plane, all learning is done outside of the child’s conscious mind. They learn by exploring their senses and interacting with their environment. During the second half of the plane, from about 3-6 years, children enter the conscious stage of learning. They learn using their hands, and specialized materials in the Montessori classroom were developed with this consideration.


During this time, children have a wonderful sense of order. They are methodical and can appreciate the many steps involved in practical life lessons in their classrooms. The organization of the works on their classroom shelves is intentional, which appeals again to this sense of order.


The first plane is a time in which children proclaim, “I can do it myself”; it is a time of physical independence.


The Second Plane: 6-12 years


During the elementary years, children begin to look outside themselves. They suddenly develop a strong desire to form peer groups. Previously, during the first plane, a child would be content to focus on their work while sitting near others. In the second plane, a child is compelled to work with their friends. It is during this time that children are ready to learn about collaboration.


During the second plane, there is a sudden and marked period of physical growth. This may be a contributing factor to the observation that many children of this age seem to lack an awareness of their bodies, often bumping into things and knocking things over. Children begin to lose their teeth around this time as well. Their sense of order and neatness tend to fade a bit during this plane.


Throughout the second plane, children’s imaginations are ignited. Since Montessori education is based on reality, we find ways to deliver real information to children through storytelling and other similar methods. For example, when teaching children about the beginnings of our universe, Montessori schools use what is called a Great Lesson. The first Great Lesson is a dramatic story, told to children with the use of props, experiments, and dramatics (think: a black balloon filled with glitter is popped to illustrate the Big Bang, with bits of paper in a dish of water used while talking about particles gathering together). This lesson is fascinating for children in the way it is presented but gives them basic information about the solar system, states of matter, and other important concepts.


Children in the second plane have a voracious appetite for information and are often drawn strongly to what we in Montessori call the cultural subjects: science, history, and geography. While we support their rapid language and mathematical growth during this time, we are also responsible for providing them with a variety of rich cultural lessons and experiences.


It is important to note that children develop a sense of moral justice at this time. They are very concerned with what is fair, and creating the rules for a new game is often as important (if not more so) as playing the actual game itself.


This is the time in which children are striving for intellectual independence.


The Third Plane: 12-18


The third plane of development encompasses the adolescent years. During the second plane, children become aware of social connections, but in the third plane, they are critical. During this time children rely heavily on their relationships with their peers. They feel a strong desire to remain independent from adults, although they are not quite ready to do this entirely. It is our job to find ways that allow them to experiment with independence while also providing a safe structure in which they may do so.


Children in the third plane tend to require more sleep, and they sleep later than when they were younger. They long for authentic learning experiences, and Dr. Montessori imagined just that. Her ideas of Erdkinder (children of the earth) led her to contemplate a school setting that would support children’s development during this time. She imagined a farm school, in which children would work to keep the farm operational, but also contribute to planning and decision-making while doing so.  


During the third plane, children are refining their moral compass while developing a stronger sense of responsibility.


The Fourth Plane: 18-24


The final plane is a time in which young adults are striving for financial independence. They are often living away from home for the first time, and use this time to figure out where they fit into their society. Many make choices to further their education and/or explore career paths.


It is during the fourth plane that people begin to develop a truer sense of who they are as individuals.


Each plane of development should be mindfully nurtured. If a child can experience one developmental phase in a rich and carefully prepared environment, they are ready to fully take on the next phase when it is time.


We warmly welcome our current families to reach out to our office if they have any questions or would like to discuss their child's development stage. We're always here to help! 


Schedule Your School Tour 


We invite prospective families to witness and gain an understanding of the various planes of development at Wheaton Montessori School. You will see how developmental stages transpire across different age groups at our school. From the absorbent mind of early childhood to the reasoning and abstract thinking of adolescence, the planes of development are a fundamental part of our educational approach. By visiting us, you will have the chance to observe these developmental stages in real time, see our teaching methods in action, and get a glimpse of how we foster a nurturing environment for growth and learning. 


We are enrolling children who will be between 2.5 and 4 for summer and fall 2024 start dates. Prospective families can schedule a school tour by clicking on this link


How Geometry Got Its Name
By Rebecca Lingo February 2, 2026
In Wheaton Montessori School classrooms, we like to introduce big ideas with big stories. We offer children a sense of wonder first, sort of like an imaginative doorway, so that when they later study formulas, theorems, and proofs, they already feel connected to the human story behind them. One of these stories is The Story of How Geometry Got Its Name, an introduction to a subject that is far older than the textbooks and protractors we encounter today. In Montessori, Geometry is more than about shapes. It is about human beings solving real problems in the real world. A Problem as Old as Civilization To reintroduce geometry, we time-travel back around 5,000 years to the ancient civilization of Egypt. This was a land shaped by the Nile River, the longest river in the world. Each year, the Nile flooded its banks as snowmelt poured down from the mountains far to the south. The Egyptians depended on this yearly flood as it left behind rich, dark silt that nourished their crops and made life possible in an otherwise harsh desert. But the flood created a challenge, too. It washed away the boundary markers that separated one farmer’s field from another. When the waters receded, no one could quite remember where their land began and ended. Arguments ensued. “This corner is mine!” And the fields needed to be measured and marked again. The First Geometers: The Rope Stretchers To solve this annual problem, the Egyptians relied on a special group of skilled workers called the Harpedonaptai, or Rope Stretchers. These were early land surveyors who used a knotted rope tied at regular intervals and three weights to create a very particular triangle. In our elementary classrooms, we invite a few children to hold a prepared rope at its large knots, forming that same triangle. As they stretch it out and lay it on the ground, many quickly recognize what the Egyptians had unknowingly created: a scalene right-angled triangle. This shape would later become central to the geometry studied by Greek mathematicians. The Harpedonaptai used this simple tool to re-establish field boundaries, set right angles, and make sure the land was measured accurately and fairly. Geometry, in its earliest form, served a deeply practical purpose. From Rope to Pyramid The Harpedonaptai’s expertise was valued far beyond the farmlands. They also helped lay out the foundations of temples, monuments, and even the Great Pyramid of Giza. The base of the Great Pyramid is a perfect square, which is an astonishing feat of measurement and design. The Pharaoh himself oversaw these measurements, but it was the Rope Stretchers who executed them. Their work represents one of humanity’s earliest recorded sciences: the careful measuring of the earth. How Geometry Got Its Name The name geometry reflects this ancient practice. It comes from two Greek words: gê — earth metron — measure Geometry literally means earth measurement. The Egyptians did not use the language of right angles, nor did they classify triangles as we do today. Their work was grounded in practical needs. They needed to solve problems, organize land, and create structures that would endure for thousands of years. Yet their discoveries influenced later thinkers like Pythagoras, who likely traveled to Egypt and learned from their methods. Over time, the simple knotted rope inspired a whole discipline devoted to understanding lines, angles, shapes, and the relationships between them. Why We Tell This Story in Montessori When Montessori children hear this story, something important happens. Geometry becomes more than a set of rules or vocabulary words. It becomes a human endeavor born from curiosity, necessity, and ingenuity. The heart of Montessori education at Wheaton Montessori School is to help children view knowledge not as isolated subjects, but as valuable gifts passed down from earlier generations. When children pick up a ruler, explore angles with a protractor, or classify triangles in the classroom, they are continuing a legacy that began with those early Rope Stretchers, the Harpedonaptai on the banks of the Nile. Through story, students feel connected to the people who shaped our world and to the problems that inspired great ideas. Geometry becomes meaningful, purposeful, and alive, from our preschoolers working with the Geometry Cabinet , to elementary students classifying and measuring angles or using hands-on Pythagorean Theory materials, and all the way through our adolescents. At the adolescent level, geometry moves fully into the real world. Students apply measurement, angles, area, scale, and spatial reasoning through meaningful work across campus, including: Measuring and mapping land for the campus’s Wetland Conservation Area, as well as calculating classroom square footage for recognition and accreditation applications Understanding and applying area, perimeter, scale, and proportion when working with acreage, restoration plans, and campus layouts Designing and situating functional structures such as chicken coops using geometric principles Applying angle classification, measurement, and spatial reasoning through woodworking Using geometry to cut, join, and build accurately, including raised beds, greenhouses, and beehive insulation boxes
Child reaching for an object,
By Rebecca Lingo January 26, 2026
Learn how the Montessori Absorbent Mind empowers young children to effortlessly absorb language, culture, and behavior, and how parents can nurture it.