Comment by thematrixturtle

The interesting thing about caste is that it's basically invisible: unlike race, you can't tell somebody's caste by looking at them. (There is some correlation to skin color, but there are also plenty of eg Tamil Brahmins who are very dark-skinned.) Which is why caste-conscious Indians meeting new people go through an elaborate dance asking about family name, where they're from, if they're vegetarian etc to figure out their caste.