Optical illusion personality tests reveal hidden traits by interpreting what one notices first in an image. Seeing a man's face first indicates thoughtfulness and problem-solving skills, while noticing a human hand suggests quick thinking but indecisiveness. These tests are fun but not always 100% accurate.Optical illusion personality tests reveal hidden traits by interpreting what one notices first in an image. Seeing a man's face first indicates thoughtfulness and problem-solving skills, while noticing a human hand suggests quick thinking but indecisiveness. These tests are fun but not always 100% accurate.