case_images: PMC3927080_01
case_images: PMC3927080_02
case_images: Representation of FC's associations of weekdays (top) and months (bottom) with musical notes.
case_images: fpsyg-05-00106-g001.jpg
case_images: PMC3927080_02_fpsyg-05-00106-g001.jpg
case_images: F1
case_images: And everything from there (the C key) until there (the next right B flat key), is a year. And from there (C) until there (the next right B flat key), these are two years. And from there (C key three octaves higher) until there (next B flat key), it makes five years." When we asked him whether somebody taught him or he developed this by himself, he replied, "Me, because it's in my head." An illustration of this association is provided in Figure 1.
case_images: PMC3927080_03
case_images: FC's representation of numbers according two specific categories: kindness (nice, or "gentil"/ not nice, or "pas gentil") and mattering (it matters, or "grave"/it does not matter, or "pas grave").
case_images: fpsyg-05-00106-g002.jpg
case_images: PMC3927080_03_fpsyg-05-00106-g002.jpg
case_images: F2
case_images: FC explained that "January is very very bad, February is very bad, March is bad, April is good, May is very good, and June is very very good." When asked about the number/emotion correspondence, FC reported that some numbers can be "nice or not nice" or that they can "matter or not matter." In addition, the evocation (or the vision) of certain numbers cause him a physical sensation, as sometimes he reacted to certain numbers as though to a tickle, according to his parents and to our own observations. FC spontaneously provided a graphic representation of how a subset of numbers can be classified as a function of their "kindness" (nice / not nice) and their "mattering" (matters/does not matter; see Figure 2).