My earliest memory of this phenomena comes from when I was about 6 or 7. I asked my parents and grandparents if they saw certain food items as the same colors and geometric shapes that I did. I recall that the connection between objects and colors/shapes felt very very natural, as if the colors/shapes really helped me understand and organize the more complicated objects that I was perceiving, like food. It's as if I had created a hierarchy of perception. Basic shapes and colors were at the bottom and everything that was more complicated was based on or connected to those things.

Today, I am 28 and seem to have lost the bottom of the hierarchy. I no longer associate everyday objects like food with basic shapes or colors. However, I do see they days of the week, the alphabet, basic integers 1-100, months of the year, etc. as mental landscapes that I navigate in my mind. The alphabet is three rows of letters, stacked. First row A-I, second J-R, third S-Z. Months are two columns, January at the top through August and September at the top through December. Even though there's only four months in the second column, it manages to take up the same space as the first column. Go figure. Days of the week are arranged in a circle, Sunday at the top and Wednesday on the bottom. The best part is, I know why this is. One of my earliest life memories comes from when I was 3 or 4. I had a He-Man toothbrush holder with a day tracker that had a sword pointing to the days of the week, which were arranged in a circle just as I arrange them in my head! I learned the days of the week from that He-Man toothbrush holder and it determined how I perceive the week cycle for the rest of my life.

I assume that everyone does this kind of thing to a certain degree and some retain it to a greater degree than others. Like many biological phenomenae, it's not likely something you "have" or "don't have", but rather a continuum as infinitely diverse as nature and human experience.