What You Learn From Building A Treehouse:
*You learned the most common sizes of lumber, 4’x8’ sheets of plywood, and 2”x4” studs; also about the sizes of nails
*You probably figured out that diagonal bracing stiffened the sructure, whether the bracing was applied at a corner or to hold up the platform or floor of the tree house.
*You learned about hinges, if you used those to attach the trap door
*You probably learned the difference between screws & nails
*You learned about ladders, if that’s how you got from one story to the next
*You learned about pulleys
*You learned that framing must strengthen openings such as windows or the trap doors
*You probably learned to slope the roof in imitation of real homes, or because you were beginnig to understand that a slope would shed rain
*You probably learned to place the framing narrow side up; you were bginning to learn about “strength of materials”, a subject taught in engineering schools.
*You learned how to cut with a handsaw
*You learned about measurement, and three-dimensional geometry
*You learned ho the size of your body relates to the world: your arms and legs to the diameter of the tree trunk; your height to the tree height; your legs to the spacing of the ladder rungs; your reach to the spacing of the tree branches; your girth to the size of thetrap door; the height from which you could safely jump,etc.
*You probably learned from your failures more than from success. Perhaps a rope broke from too much weight; a board of 2x4 pulled off because you used nails that were too small
*You learned, by practicing, one of the essential principles of engineering: you can solve any large or complex problem by breaking it down into smaller, simpler problems
Borrowed from Last Child In The Woods by Richard Louv