The ceiling version
Same loose layout, opposite direction. Everything drifts up, gathers along the top edge and stays there jostling. Nothing ever comes to rest properly, which is either relaxing or irritating depending on your mood.
Move the cursor through a cluster and it scatters. You can sweep the whole page from one side of the frame to the other without pressing anything, which is the part people fiddle with for longer than they mean to.
Hold something down
Drag a block to the floor and let go. It climbs straight back. Try to pin two at once and you cannot, because your cursor pushes rather than holds. That small frustration is basically the entire game.
Where it sits
Searches land here as floating google or google floating, sometimes with space in the name. It is the calm end of the family that starts with google gravity and gets nasty at the black hole google easter egg.
If you want the wet version, google underwater floats the same layout on a current with fish behind it.