300 meters (approx) separate these 2 pictures. 4 feet in pairs of 2 for each case (plus a ghost foot?). The first one is in the middle of a sidewalk, and it doesn’t have (apparently) any functional meaning. It’s therefore even more significant. Second picture has been taken in front of an ATM machine (you can see feet of somebody using it).
They share similarities, but they surprise for how different they are: in one case they mark somebody’s steps (maybe jumping, or playing) while in another case they strongly recommend one’s position (as they give indications on how to queue). They both invite people replicating the position, but while in one case they just foster playful movements, while in the other they create empty spaces.
Moreover, I have the impression that the second picture is also creating a gender barrier: these are clearly men’s soles.