I have alphanumeric synaesthesia, in which I associate specific colors with numerals and the letters of the alphabet. These associations have been permanent and unchanging since I began to notice them at about age four or five.
These two clocks render the time and date using these colors. This first clock is rendered in the format HHMM over MMDD:
This second clock is rendered in the format HHMMSS over YYMMDD:
I have also prepared self-portrait using a synaesthetic coding system for each pixel:
A writeup for this coding is available here. This particular scheme also lent itself to textual encoding, as with these three grids, using the first 100 digits of the transcendental numbers π, e and phi: