Well, first the lovely watercolor painted envelope from Heleen de Vann, with portrait of Hannah:
see, even she has "TIME" ( barely) for mail art:
and were is the BLUE?
ah, inside was the BLUE...(and ORANGE) birdie! An original watercolor ATC:
Also, Heleen did some good research and sent info about Hannah Hoch,
and the German postage stamp in her honor:
a fine artist indeed!
Thank you, Heleen,this is very special!
And thanks for making the Hannah Hoch fan club group :-)