I know this is an old thread, but I was just doing an internet search on synesthesia and this thread popped up.
I never knew what synesthesia was until recently. I mentioned it to DD14 and apparently, she has it and knows all about it. She associates colors with letters, numbers, and days of the week.
DS12 only associates colors with numbers.
I don't associate colors or sounds or tastes with anything, but I see dates, days, weeks, and months as if they're physically on the ground. It's really weird. For the months of the year, I see my old backyard, driveway, and sidewalk of the house I lived in when I was very young. January starts where the driveway and sidewalk meet, then Feb, March, April, & May are along the sidewalk. June turns down the walkway that led to the back porch. July and August go across the back yard, Sept goes along the side of the driveway and Oct & Nov go along the back of the driveway. Dec completes the driveway and meets up with January. I guess it's like a slightly misshapen oval, but it's ALWAYS in that same spot.
I never knew that everyone didn't do this.