Ink does not respect letterforms. It pools at the terminals, thins in the middle of a stroke, and sometimes gets up and leaves. Every calligraphic script is a record of somebody trying to control that, and every modern typeface is a decision to pretend it does not happen.
This page pretends the opposite. The word above is a set of particles: each letter is a cloud of drops held together by a surface tension you can set, falling under a gravity you can set, and merging when they touch. Raise the tension and the letters tighten into something you could print. Lower it and they run.