Abstract: An interlocking toy building block includes a first block body and a first magnet positioned therein a first distance from a first outer surface thereof to provide a first predetermined magnetic polarity to the first outer surface. When the first outer surface is brought into close proximity with a second outer surface of a second block body having a second magnet positioned a second distance therein and exhibiting a second predetermined magnetic polarity opposing the first predetermined magnetic polarity, the first outer surface is configured to mate with the second outer surface in an interlocking position. A potential magnetic force Fm between the pair of magnets is determined by the formulation: Fm=Fo e?rd where Fo is the initial force (i.e., no separation distance between magnets), and e?rd is the exponential function of the rate of decay “r” of the magnets and the distance “d” between the magnets.