As it is absolutely pitch-black, the bee has to relay on its sense of touch through its antennae and fine hairs on its body. The sense of touch is important for:
Communication - dance language
Sense of position - Where is upside, where is down?
Building of combs - sextangled cells, vertical combs, distance between combs
The revolving model shows the function of the sense of position. When the bee crawls upwards, the head, because of its own weight, falls towards the breast and thus stimulates the touch sensitive hairs. When the bee crawls downwards, the head falls towards the neck and presses on the hairs on the opposite side, thus communicating to the bee its own position.