Silverflexagons are fascinating manipulative toys made from folded strips of paper which, when flexed, change shape and pattern in complex and remarkable ways. This book explains many of the most interesting silverflexagons and gives hints for exploring further. The Flexatube is probably the greatest paper puzzle ever invented. It is not technically a silverflexagon but it is very like one and equally interesting to play with. This book gives seven and a half distinct solutions and shows how to vary the puzzle to make it more challenging to solve.