Penrose on Penrose

Roger Penrose standing on a Penrose-tiled floor at Texas A&M University.

(From the comments here.)

Update: I dug out the old set of Penrose kites and darts that I made many years ago.

Matching the ends of the curved lines enforces aperiodicity.

I also made a set of Penrose rhombuses, but the kites and darts look more elegant.