Zbigniew Rybczyński's Tango is a pre-digital compositing work built on a single principle: accumulation. A static room. Thirty-six characters, each assigned a looping action, layered one by one using hand-painted cell mattes and optical printing. The piece won the Academy Award for Best Animated Short Film in 1983.
For motion design students, it makes the logic of iteration visible at its most fundamental: one loop, one layer, repeated until the frame is saturated. What compositing software now handles in seconds, Rybczyński solved by hand over seven months.