How do I find a Taiwanese Aborigine?

Multiethnic Taiwan? That slogan seems to be rather odd for Westerners like me who from kindergarten on are used to socializing with immigrants from all over the globe. How many non-Han Chinese sit there in the morning on the same subway train I take? Sure, there is the occasional Caucasian English teacher, an Indonesian maid pushing a senior citizen´s wheel-chair, and once or twice a month I can spot a group of Japanese housewives on their way to the National Palace Museum. But Aborigines? I have never met any. What do they look like? Would I even notice an Aborigine if one happened to cross my path?