I came across this on Create Digital Motion it is a video of ANTIVJ who do artistic projection mapping, light sculpture, outdoor projection, stuff.  This basically means “painting” architecture and objects with projected images. It isn’t something I’ve had time to look at but I’m intrigued and would like to investigate this more – not that I think I’ll be able to do this sort of thing:

This video is a live performance at Cathedral of Breda, NL with original music by Thomas Vaquié, played on organ by Gerard Maters with light design by Giacinto Caponio, Grote Kerk is a sublime modern, digital spectacle, a light and sound show all performed live using software from arKaos.