 (1) The Collimation Argument (burhān al-musāmita): Consider the line \(L\) which begins from the center \(O\) of a circle \(C\), intersects the circumference of \(C\), and extends infinitely. Suppose, moreover, that there is a distinct line \(L'\) that is parallel to \(L\) and infinitely extended in both directions. Now suppose that \(L\) starts to rotate around \(O\) and gets closer to \(L'\), while \(L'\) is motionless and fixed. As a result, \(L\) and \(L'\) intersect. So, there is a time at which the two lines are parallel and there is a time at which they are intersected. Therefore, there must be a moment of time \(T\) and a point \(P\) on \(L'\) at which the two lines intersect each other for the first time, or so the argument goes. But obviously there are no such \(T\) and \(P\). For every \(T\) in which \(L\) and \(L'\) are intersected, we can find an earlier moment of time \(T'\) (i.e., \(T' &lt; T\)) in which the two lines were already intersected. So, it seems that we have a contradiction. On the one hand, there must be a first moment of intersection (or such is the expectation of the defenders of the argument). On the other hand, there cannot be such a moment. Therefore, the initial assumption of the argument—that is the existence of infinite lines—must be rejected. There is no infinite one-dimensional magnitude and, consequently, no infinite magnitudes in general.