An Interview with Storm Thorgerson - "Mind Over Matter: The Images of Pink Floyd" (Sanctuary Publishing; ISBN 1-86074-224-6), the new book by Storm Thorgerson, designer of nearly every Pink Floyd album cover, as well as loads of other classic images.
Or see the video bio this was taken from, on WTUE's webpage. The direct links are LOW BANDWIDTH and HIGH BANDWIDTH. These require Windows Media Player. If these links get changed just visit WTUE Online and do a search for Pink Floyd!