The Book of Pleasure could be regarded as the central text among Austin Osman Spare's writings. It covers both mystical and magical aspects of Spare's ideas; as the modern ideas on sigils (as now have become popular in chaos magic) and Spare's special theory on incarnation are for the first time introduced in this book.There are some chapters in The Book of Pleasure that Spare has referred to within the text, but are omitted. It seems that they were destroyed during World War II