They can either be even (on the same line) or odd (more staggered). Imbricated, meanwhile, means that the petals overlap with each other on one edge, forming an endless twist like the Penrose stairs.

The Alabama Court of Civil Appeals has issued several orders on narrow grounds that have created a sort of Penrose stairs connecting the trial court and the appellate court.

Knowing that this was a reference to the ‘Penrose stairs’ created by M.C. Escher is one thing, but seeing it come to life on screen actually felt magical. And that line sealed the illusory effect.

This tricky visual illusion is also known as a Penrose stair, named after its ... Materials Science Jun 10, 2011 2 0 ...