- Draw an up-pointing equilateral triangle that fills most of the page.
- Lightly mark the midpoint of each line of that triangle.
- Draw straight lines connecting each of those marks.
This forms four new triangles: three that point up, one that points down.
- Choose any empty, up-pointing triangle on the page.
- Go to instruction 2.
Yes, these instructions will go on forever. I’ll interrupt you in a minute.