Technical advice was given by Dominic Robson

A miniature vehicle that detects and follows a black line whilst it reads crossing coloured lines
and translates this RGB data into sound. Users could draw a randomly shaped circuit using
a black marker pen on a piece of paper and the colour chaser followed the line.
then add different layers of colour across the black line at intervals the vehicle detects
the colour RGB data and translates that into sound.

photo © Hitomi Kai Yoda