Details

Snapshot 1: the first and second types of Wunderlich curve begin with an S-shape, where the start and end points of the larger figure and each copy of the figure are at opposite corners of its bounding square; the third type has start and end points at adjacent corners of the bounding square.

Snapshot 2: hiding the connections between copies of the figure makes the relationship to the seed shape clearer

Snapshot 3: as with any plane-filling curve, the limit of any of the Wunderlich curves is the unit square