The three qualities of space and time reciprocally affect and qualify one another in experience. Space is inane save as occupied with active volumes. Pauses are holes when they do not accentuate masses and define figures as individuals. Extension sprawls and finally benumbs if it does not interact with place so as to assume intelligible distribution. Mass is nothing fixed. It contracts and expands, asserts and yields, according to its relations to other spatial and enduring things.... these are then the common properties of the matter of arts because there are general conditions without which an experience is not possible. As we saw earlier, the basic condition is felt relationship between doing and undergoing as the organism and environment interact.