One figure with a long history in art and architecture is the Golden Spiral, a kind of spiral that becomes wider, every quarter turn, by the numerical factor φ = 1 + √5/2. The Golden Spiral appears in a few places in Mathemalchemy, including inside the Curio Shop and on one of the pages in the Cavalcade. (Can you find them?)
The Curio Shop prominently features another mathematically-derived spiral: the Harriss Spiral. This spiral is derived in a way similar to the Golden Spiral, but instead of iteratively dividing a rectangle into a square plus a similar rectangle, it iteratively divides a rectangle into two similar rectangles plus a square.
Can you find Harriss spirals in three different places?