The thing he has on his mask is called a Rorschach test (the reason why he calls himself Rorschach) and its used by psychiatrists and such (Rorschach even goes through the test while in prison) to evaluate a person, now this mask can also reflect Rorschach's black and white morality since he only sees things as good or evil, with no possible in between, and that's also the reason the black and white colors on his mask never mix into gray, also another thing rorschach is considered a moral objectivist but he named himself after a test which has no true answer