Golden Spiral

1, 1, 2, 3, 5, 8: each new square is the last two added up. They wind into a spiral, and the last two squares lock onto 1.618.

Squares Speed Show

The first square is 1 cm. Drag to look around, pinch or scroll to zoom, tap the picture to play or pause.

Your turn: How many squares until the spiral is wider than a football pitch?

Share or take it home

One HTML file, no install. Space play/pause · → one more square · R reset

From the videos