Tango

No, not the airline. This is an amazing film by Polish director Zbiginiew Rybczynski that won the 1983 Oscar for best animated short. And even more amazing in that he pretty much planned out and composited everything together by hand (there being no digital then). The closest description I can think of offhand is what it would be like if Escher drawings moved.

This Michel Gondry music video (Warning! Turn the sound OFF OR DOWN before you watch this video because 1) it blasts in about 10 times the sound level of Tango and; 2) the song—by coughKylie Minoguecough—is seriously stupid) is also very cleverly done, and a nice homage to Rybczynski’s piece.