 Likewise, in radical disruption cases like that of the bicycles, perdurantists typically recognise a number of different temporarily-coincident four-dimensional objects. Suppose the bicycle your uncle gave you starts off made of parts A and parts B, and the bicycle your aunt gave you starts off made of parts C and parts D. After the switch-around, you have a bicycle made of parts A and parts C, and a bicycle made of parts B and parts D. Perdurantists recognise (at least) the following four-dimensional objects: