I used to do stuff like this when I was young except I couldn't draw. I would describe instead.
The mental phenomenon is termed eidetic vision and depends on being able to conjure up in the minds eye an exact picture of what one has seen. My eidetic vision came from not talking much until just before I went to school. The silence didn't flow from being unable to say words but from neglecting even to think them. I dealt in pictures. For example the "voice in the mind" would never say "Empire State Building". Instead, a perfectly detailed picture of the Empire State Building would pop into my "mind's eye". If I could count that far I would get the number of windows right, which ones had the shades drawn, which were open; perfect.
Going to school forced me to master language (haven't shut up since) and the eidetic images faded. Maybe my dedication to photography is a last grasp to recreate some of those super detailed pictures-in-the-mind?