Self Working Mental Magic, by Karl Fulves, is an extremely useful book- if not for all of the effects themselves- then at least for the principles introduced. I didn't use many of the tricks exactly as they were presented, however I did find that using the basic premises to create variations on several of them elevated the effects to professional status. I would recommend this book to any amateur magician who is thinking of getting started in mentalism. I think it has many excellent principles contained within its pages. Some of the suggested presentations seem a little elementary, however this is to be expected since the book is aimed at beginners. As stated earlier, the tricks lend themselves quite easily to improvements and variations. The section on "book tests" has some nice effects, and Fulves' variation on the classic "7 Keys to Baldpate" make the book well worth the price. Armed with this book, and a little creativity, any magician will have a number of mental miracles at their fingertips.