2.3. Fivefold Knot. In the next example we start with the structure of Figure 3, M.C. Escher’s design of two interwoven grids (Figure 11a). The first step is to replace the outlines of the blue pentagonal shapes, which are the holes of the structure, by fivefold knots. We do this in such a way that the fivefold knots become connected (Figure 11b). Also in this example we continue to add a soap film (Figures 11 c-h). And again we see that the result is a single surface interwoven layer structure that looks like a structure consisting of two different layers (Figure 12).
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Figure 9: Soap film on a net of fivefold knots
Figure 12: Interwoven layer structure based on a fivefold knot pattern