I attended two universities. Harvard expelled me twice. I did not graduate from either.

I attended a third university for my entire life. It never expelled me. It never charged tuition. It never gave me a grade. It gave me everything I know.

That university is nature.

The Syllabus

Here is what nature taught me, organized as a curriculum. Every lesson is a design principle. Every design principle is observable in the physical world. You do not need to believe anything. You need only to look.

Lesson 1: Triangulate Everything

Nature's structures are built on triangles. The hexagonal honeycomb is triangles. The crystal lattice is triangles. The DNA helix, when you look at its cross-section, is a series of triangulated connections. The geodesic patterns on a radiolarian (a microscopic ocean organism) are triangulated spheres.

Why? Because the triangle is the only polygon that is structurally stable with flexible joints. A square with hinged corners collapses. A triangle with hinged corners holds. This is not an opinion. It is a mechanical fact. Build it with popsicle sticks and see.

Design principle: If it must hold its shape, triangulate it. If it does not need to hold its shape, do not triangulate it. Structure where you need structure. Flexibility where you need flexibility.

Lesson 2: Distribute the Load

A tree does not concentrate its strength in one trunk and leave the branches unsupported. The trunk distributes load to branches, which distribute to smaller branches, which distribute to leaves. Every element carries a proportional share. No element is idle. No element is overloaded.

A spider web distributes the impact of an insect across the entire structure. No single thread absorbs the full force. The web is stronger than the sum of its threads because the distribution means no thread reaches its breaking point.

Design principle: Never concentrate the load. Always distribute it. The strongest structure is the one where every element works. The weakest structure is the one where a few elements carry everything.

Lesson 3: Close the Loop

Nature recycles everything. A leaf falls, decomposes, feeds the soil, feeds the tree, produces a new leaf. The cycle is closed. No waste exits the system. Every output is an input to another process.

The carbon cycle. The water cycle. The nitrogen cycle. The phosphorus cycle. Every element on Earth has been recycled billions of times. The iron in your blood was in a dinosaur, was in the ocean, was in a volcano, was in a star. Nothing is new. Nothing is discarded. Everything circulates.

Design principle: If your process produces waste, your process is incomplete. Find the use for every output. Close the loop. The goal is not zero waste. The goal is zero waste by design, because every output has a destination.

Lesson 4: Use Tension, Not Compression

Most human buildings work by stacking heavy things on top of heavy things. Compression. Bricks on bricks. The building fights gravity by being heavier than the force trying to knock it down.

Nature rarely builds this way. Nature prefers tension. A spider web is tension. A cell membrane is tension. Your muscles are tension. A suspension bridge is tension with compression only where needed. Tension is lighter, more flexible, and more efficient than compression.

Design principle: Wherever possible, replace compression with tension. Hang it instead of stacking it. Pull instead of push. Tension does more work per unit of material than compression. The tensegrity structure — islands of compression in a sea of tension — is nature's preference.

Lesson 5: Maximize Surface, Minimize Volume (or Vice Versa)

When nature needs to absorb (lungs, intestines, roots), it maximizes surface area relative to volume. Your lungs have the surface area of a tennis court, folded into your chest. Your intestines, unfolded, would cover a studio apartment.

When nature needs to conserve (a cell, an egg, a planet), it minimizes surface area relative to volume. The sphere is the shape with the minimum surface area for a given volume. That is why bubbles are round. That is why planets are round. That is why cells are approximately round.

Design principle: Match the geometry to the function. If you need exposure (solar panels, radiators, filters), maximize surface. If you need enclosure (habitats, storage, containment), minimize surface. The geodesic dome minimizes surface area per unit of enclosed volume. That is why it is the most efficient shelter.

Lesson 6: Grow, Do Not Assemble

Human manufacturing assembles. We take separate parts and put them together. Screws, bolts, welds, adhesives. The parts are made separately and joined after the fact.

Nature grows. A tree does not assemble its branches onto a trunk. It grows them from within, as a continuous structure, with no joints, no fasteners, no seams. A bone grows as a continuous matrix. A crystal grows by adding atoms to an existing lattice.

Design principle: Where possible, grow rather than assemble. 3D printing is the first human technology that approaches this principle — it builds layer by layer from a single continuous process, with no assembly required. The future of manufacturing is growth, not assembly.

Lesson 7: There Is No Straight Line in Nature

Look for a straight line in a forest, an ocean, a mountain range, a river delta. You will not find one. Nature builds in curves, spirals, branches, and fractals. Straight lines are a human abstraction — useful for mathematics, misleading for design.

The shortest distance between two points on a sphere is not a straight line. It is a geodesic — a great circle arc. The dome is named for this: the geodesic dome follows the geometry of the sphere, not the geometry of the grid. It curves because the surface it encloses curves. Fighting the curve wastes material. Following it saves material.

Design principle: Follow the curve. The curve is there for a reason. The river curves because water seeks the path of least resistance. The tree curves because it grows toward light while resisting wind. The galaxy curves because angular momentum is conserved. Build with the curve, not against it.

The Final Exam

Nature does not give final exams. Nature gives continuous assessment. Every structure is tested every moment — by gravity, by weather, by time, by the forces that act on it. A structure that fails the continuous assessment collapses. A structure that passes continues to stand.

The geodesic dome passes nature's continuous assessment because it was designed by nature's principles. It triangulates. It distributes load. It minimizes surface area per unit of volume. It curves with the sphere instead of fighting it.

Every building that collapses, every bridge that fails, every system that breaks down is a structure that violated one or more of nature's lessons. Nature does not punish. Nature informs. The collapse is the information. The lesson is in the rubble.

The curriculum is free. The university is everywhere. The tuition is attention. Pay attention to how nature builds, and you will learn more about design than any school can teach you.

I attended this university for eighty-seven years. I am still enrolled.