Kvant, 1979, N2
Such classic impossible figures as impossible triangle, impossible trident, endless staircase are painted at the cover. Also you can see at top left corner an impossible figure from Theiry class of figures.
Kvant, 1980, N8
A classic impossible triangle pattern were user for filling the cover above.
Квант, 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