Humans mostly look different from eachother. So, take all the ways people can look different from eachother, such that you’d notice, and name each of them as dimension, and assemble those dimesions into human appearance space. We humans aren’t spread out uniformly across that space, there’re clusters and empty patches, and we can, perhaps, name those clusters different things. There are two kinds of dimensions in that space though, innate dimensions are things that most people have little control over1, whereas presentation dimensions are more intentionally changable.