This does not occur to a person at home until he really tries it - even so, a trivial thing can decide a person at that moment. When we and the students were still showing the diagonals (body, wall) in the prisms, there was quite a problem, because it was badly represented. Although I borrowed models of the cube and the cube from the accompanying teacher, the diagonals were only indicated here - not all of them were here.
When we and the students were still showing the diagonals (body, wall) in the prisms, there was quite a problem, because it was badly represented.