 As for the relative notions of continuity, the explanations can be quick. First, discrete objects might be said to constitute a continuous whole relative to a motion. For example, all the connected cars on a moving locomotive are clearly distinct and separate things, and yet they move together as a continuous whole. Second, discrete objects might be said to be continuous according to Aristotle’s definition (2) relative to some shared extremity. For example, for any angle ∠ABC greater than or less than 180°, the lines AB and BC share one and the same extremity, B, and yet are distinct and jointed. Neither of these senses is strictly speaking the target of the atomist’s critique nor the thesis concerning the continuity of bodies and magnitudes that Avicenna (or other Aristotelians) is keen to defend. Thus for Avicenna only (3), that two things are continuous if and only if there is a common boundary at which they join together, captures the proper definition of continuity. 