Today when two political parties—members of closely-related species–in Washington can’t agree on anything, it seems incredible that two very dissimilar species–a dance choreographer and a metropolitan transit system—could forge an alliance. But according to The New York Times choreographer Jean Isaacs and the San Diego Metropolitan Transit System did just that in 1998, and this year celebrate their 15th anniversary (San Francisco picked up on the idea five years later so theirs is their 10th). Yeah, we know it’s not couples dancing (no cha cha’s or waltzes), but it IS social (or at least sociable) dancing. And the audience does a lot of the moving, as they board public transit, alight at various stops, and watch 10-minute dance routines (often in imaginative venues).