Coffin three Piece

The isometric view of the base of the assembled puzzle represents the logo of a large USA corporation.
A very baffling three piece interlocking polycube assembly.
Although Stewart's original is constructed from regular cubes, I chose to fabricate the "cubes" from 15mm square stick (see illustration above). This has resuled in a much stronger construction, with no quarter face glue joints liable to failure.
Read more in Stewart Coffin's "The Puzzling World of Polyhedral Dissctions"