Because of the Buddhist view of history, their symbol is understandably a wheel. It stands for their belief that history is cyclical, i.e., it repeats itself because of bad karma. Probably one of the biggest stumbling blocks in communicating with those of Eastern faiths is a failure to comprehend their distaste for western logic. For most Eastern worldviews, logical contradiction is not a problem. For an Easterner, reality is only spiritual, i.e., eternal spirit.
Diversity is an illusion.
To have a concept of myself as an individual is diversity, an illusion that hinders the quest for nirvana. There are no universals and no essence of things except the impersonal universal spirit. Your actions in the present will affect your future life. Bad karma hinders your journey toward nirvana. Good karma takes you nearer.