Human ocular heterochromia

I've previously written a post about heterochromia in animals (with a couple interesting photos), and mentioned there that some humans have the condition - Dan Aykroyd, David Bowie*, Kiefer Sutherland and Christopher Walken are listed as examples.  Today I encountered a post at Environmental Graffiti that includes a gallery of ten photos of human heterochromia.

*David Bowie has anisocoria, not heterochromia.

(Photo credit Rakesh Ahuja, M.D.)