When the author was studying to be an engineer, a teacher asked them quite interesting puzzles that offer and you decide.
So - a condition before you drawn two characters (see. Picture) build a third projection.
If you guessed it, please: do not lay out an answer right away, give other users also think. For solving the teacher promised Ladder.
Well, people razoshёlsya: someone said it was a void in the cube, what it reasonably argued that in this case the edge of the hollow recesses would be indicated by dotted lines. Someone said that the outer wire cube, but in this case always have an engineer to how these figures are attached to each other. In general, both the wrong answer. On two projections - solid, monolithic body.