My dad is extraordinarily nostalgic, and saved most of my schoolwork from kindergarten through college. He recently discovered this in the "L pile", a painting from 4th grade. My memory is atrocious, but for some reason I remember making it. I remember mixing those blues, specifically the greyish blue in the bottom left corner, and I remember the chalky texture of the dry paint (probably tempera). Seems this love of geometry didn't start when I was 17 like I thought, but actually about 8 years prior.