The floor has first of all a pragmatic meaning, much more than the walls and especially the ceiling. One must be able to move around on it and place objects on it. Gravity confers on it a role linked to the idea of support of life and objects. Variations in texture can give it a specific importance but, as a general rule, it must remain horizontal in order to guarantee versatility and the possibility of movement which we expect from most architectural spaces. In this context differences of level and staircases are very important. The ground is therefore less manipulable than the walls and the ceiling – because of this fact it has a stabilizing character, unifying different parts of space.
We walk on it; Western man hardly ever uses it for sitting or lying on, touching with his hands or the rest of his body. It could be that his preference for carpets betrays an ‘attempt at reconciliation’, the reestablishment of an essential relationship between the body and the built floor. We should remember that there are two sorts of artificial ground: the covering of the earth – our paving stones and tombstones – and the floor, the ground of an upper storey, lighter and more artificial. The materials used and their design are a response to location and means of support.《 Elements of Architecture：From Form to Place 》