Whee! I love these.
This is a picture of one of the many sidewalk "perspective" drawings, made famous by Julian Beever, sweeping popular art.
Depending on how you look at it, the sidewalk drawing appears to be three-dimensional or very deformed. For example, looking at this drawing from an incorrect angle actually causes it to appear like this!
This image is from a Japanese artist who does other sidewalk drawings like this. You can see more of these and different drawings from other worldwide artists on Hemmy.net.