las xi, 49, 310 Hogarth, Mark 280 Hole in the Wall Project 35 Holmes, Sherlock 148 hologram 290 Hong Kong 88 horizontal abstraction 266 Horn, John 29 Hounsfield, Sir Godfrey 102 Howell, Emily 7, 310 Hubble 348 Hulme, David 41 hunters and spears 181 hyper-communication 285-294, 293 audio field 291 bandwidth 28