Rotate it by 180° and the two hearts transform into two rings or hold it in front of a mirror.
For the best effect look at a 30° angle down to the ...object.
Inspired by the circle/square ilusion invented by Kokichi Sugihara, analyzed by Professor Dave Richeson, and posted by landisbs.
Here a video: https://youtu.be/Wv8Hu0mdb4Y