Introduction

It is our day-to-day experience that rigid objects, e.g. two books, can be placed right next to each other, in a way that they touch but don’t overlap. However, if we think of space as composed of points, meaning that space is nothing more than a set of points, the concept of touching becomes different: namely, if two geometrical objects touch each other, they always overlap. For example, when a cube touches a sphere, they will have one point in common where they overlap. This is inconsistent with our intuition that a given piece of space, even a single point for that matter, cannot be occupied by multiple rigid objects at the same time.

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