Covers of popular scientific russian magazine "Kvant" about phisics and mathematics.
Kvant, 1979, N2
Kvant, 1980, N8
A classic impossible triangle pattern were user for filling the cover above.
Kvant, 1980, N10
Impossible penetration of brushes through frame of cube. This construction is impossible if there's no hidden breakes in the frame of cube.
Kvant, 1989, N6
Impossible combination of pencils. Therefore we assume that pencils are straight and they don't have breaks this construction looks impossible.
These images were found at the site of the magazine http://kvant.mcnmo.mccme.ru