A couple of artists based in Germany created a street art installation that gives a tree on the side of a country road the appearance of floating.
Everybody wants to be on the inside of an inside joke. It's a fact. Nothing feels less inclusive than hanging around mutual friends who have somehow developed a running bit while you were off doing something else. Perhaps that's why it must be such a joy to discover single-point perspective art interventions out in the wild. It's like an inside joke just between the artist and you--unless it's really awesome, in which case it will most certainly end up on the Internet.