Dorodango

Dorodango: lumps of mud polished into shiny spheres, made by small children in Japan.

A good Freudian would blame it on early childhood training: some musicians need to get everything perfect, every detail accounted for, every surface polished and neat; others need to leave some things unfinished, unsaid, a bit messy, uneven; most musicians probably find themselves between these extremes, balancing or oscillating. But I think that there's probably a better music-evolutionary reason for this particular form of biodiversity: it keeps our musical lives lively and interesting, full of variety, even if the basic materials available to us are all pretty much the same.