A Magic Jigsaw

https://commons.wikimedia.org/wiki/File:Geomagic_square_-_Magic_Jigsaw.jpg
Image: Wikimedia Commons

A “self-interlocking” geomagic square by Lee Sallows. The 16 lettered pieces pave a single large square, and smaller squares can be produced by various groups of four pieces — those drawn from each row, column, and long diagonal, and 10 other symmetrically chosen quartets.