Neurons in the brain switch identity and re-route fibres

"Like the entomologist in search of colourful butterflies, my attention was drawn to the gardens of the grey matter, which contained cells with delicate and elegant forms, the mysterious butterflies of the soul, whose beating of wings may one day reveal to us the secrets of the mind" - Santiago RamA3n y Cajal.

http://www.guardian.co.uk/science/neurophilosophy/2013/feb/26/neurons-in-the-brain-switch-identity