The younger child usually sleeps on the lower circle, the senior — on top.
Also assembly by the hands from two ready identical cribs of one two-story is possible. In this case work becomes simpler, and material it is required less – to a framework fasten ready a box.
The second circle settles down at such height that the senior child could sit on the lower circle, without touching by the head of a bottom top, and did not touch a ceiling, being on the floor.
Fastening of a bed possible also to a floor or a ceiling, is simple to put it about a wall without additional fixing to the bearing designs it is undesirable.