What a surprise it was to find the contemporary Athens Museum installed in the Fridericianum in Kassel, the central museum location of Documenta for 71 years. But there it is, a rousing and delightful look at contemporary Greek art. ANTIDORON. The EMST Collection “Antidoron” (αντίδωρον, literally the return of a gift). The small part of the Athens collection (about 15%), 82 artists and 180 works, shown here also includes some Americans, such as Janine Antoni, Lynda Benglis, Joseph Kosuth, Bill Viola, and others, each with very expressive works that represent them well. These American works are old hat to art world lookers. The real prize here is all Greek. The works here are an exciting introduction for an outsider.