David Hockney's investigation into the newly invented technology of colour photocopying in 1986, which resulted in the series Home Made Prints, typifies the artist's restless drive and skill in invention over 6 decades. Fascinated by the new devices, Hockney deconstructed the multi-colour printing capability of these office "cameras" and created a series of works, each made by the artist himself with no proofs. Puzzled by the flatness of colour photocopies generated by the early Xerox machines, he set out to see if they could be improved upon and soon realised that the colours sharpened if printed one coloured layer at a time. He demonstrated that prints made from these machines with care, attention and enquiring skill are vastly superior to their products when used as intended, i.e. to make a coloured copy in one single pass. This demonstration, and this typical mode of enquiry, defines what makes Hockney one of the greatest artists working today.