No. 487 & No. 488 - arriving mail art "Ergeben vier Viertel ein Ganzes?" from Uli Grohmann (Germany)

No. 487 & No. 488 - arriving mail art "Ergeben vier Viertel ein Ganzes?" from Uli Grohmann (Germany) - two artcards, one sent inside an envelope with the question whether four quarters will fill a whole and some colourful pop-art stylish portraits of Bismarck. Thank you very much