1. A computer-implemented method comprising: determining, using one or more processors, a first set of brush strokes, each brush stroke being based on a two-dimensional vector; generating, using one or more processors, a first frame from the first set of brush strokes; perturbing, using one or more processors, the first set of brush strokes to create additional sets of brush strokes; and generating, using one or more processors, additional frames from the additional sets of brush strokes, wherein the first frame and the additional frames form a sequence of frames that are time-coherent.