Area grows by the square
Make every length k times as long and the area grows k × k times: twice as wide and tall is four times the area, and half as wide is a quarter.
By age
- Ages 3–5 Not made yet.
- Ages 6–8 Not made yet.
- Ages 9–14
- Ages 15–18
Meeting one idea in a second world is where it starts to belong to you, not to the world you met it in. These pages are a design, not a promise.