combined advertising/motivational/propaganda(?) material from the messe der meister von morgen* (mmm) and the weltfestpiele der jugend und studenten** that have taken place 1973 in east-berlin, then capital of the gdr. apparently now used to shade a cellar from the sun? found in berlin mitte which indeed is part of east-berlin.
i somehow like the zooming-in effect here, but i’ll fully understand if you think that’s cheesy :)
*trade fair for the masters of tomorrow, the name of a yearly held youth science competition in the GDR
** world festival of youth and students (just for fun you could search the 1973 logo on the german wikipedia page and match it with the partial logo on the pictures here)