Summary: The article presents pairings of 2-dimensional (2-D) shapes occupying space inside other shapes to 3-dimensional (3-D) analogues. It provides the formula to obtain the proportion of volume of a cube occupied by a sphere in a cube. It cites the formula to obtain the volume of a sphere occupied a cube in a sphere. It notes formulas to obtain the ratio of the volumes of cylinders in a cube and similar scenarios.