These are all over Sternschanze / Feldstrasse right now. They remind me of a Picasso style paste up that that i saw around Rote Flora a couple of summers ago. That was an isolated one off piece – at least i don’t recall seeing others, but it really stuck with me. Along with other examples like the above, there was also the following:
The style makes me think of the Austin Osman Spare’s automatic drawings, but more minimal. The fine lines in the one above flow perfectly, must be wonderful to feel them come out onto paper!