Meet Hebitsuke, the friendly felt snake whose eyes light up with joy when he bites his own tail. The snake is the work of the Techno Shugei (Handicrafts) group who published a book in November 2011 containing instructions on how to construct Hebitsuke — a combo of circuit boards with fluffy materials — and much more. The book, which bears the same title as the group, is proving to be a surprise hit, enjoying steady sales with people keen to try their hand at sewing, knitting and simple circuitry.