L-bow Dovetail was Norman Sandfields exchange puzzle at IPP 19 in London, 1999. This famous puzzle appears impossible to the untrained eye, since its two dovetail joints run in different directions. The puzzle is perfectly solvable though, when solved it reveals a small compartment with original elbow macaroni inside. The puzzle does NOT come apart completely, by design, to prevent small pieces from falling out. Only 200 copies were made.