Ambigram OK (tessellation)

90° rotational symmetry.

Four orientations. Created from a pentagon containing two right angles (isohedral type IH28 from the book Tilings and Patterns by Branko Grünbaum and Geoffrey Colin Shephard).

20 August 2021

This drawing is available on Wikimedia Commons with a free license CC BY-SA 4.0 (Attribution-ShareAlike 4.0 International) - © Basile Morin