This image, taken at one of Alex Mclean’s ‘on the hoof’ software art performances, shows how feedback can have immense precision and require considerable intellectual dexterity. Alex notes that: ‘If the programmer is to share the continuous artistic process of a painter, their performative movements must be reactive, they must be live. Code must be interpreted by the computer as soon as it can be written, and the results reacted to as soon as they can be experienced. The feedback loops must be complete.’