Last night, I was reading about synesthesia when I realized how advantageous it is. It makes it a lot easier to remember numbers and the spelling of words. I think of words and numbers as patterns of colors, shapes, and personalities. Changing just one letter in a word makes a big difference in its appearance. Sort of like changing a color in a flag.
According to Wikipedia (not exactly a reliable source), perceiving time/dates in a multidimensional landscape is considered synesthetic (2005 is close, 1901 is far, 1310 is farther; morning is up and evening is down). I thought everyone thought this way. Being able to manipulate multidimensional images representing dates, geography, numbers, etc. is really convenient. If this really is a synesthesia thing and not a normal thing, then synesthesia is quite advantageous.