The coordinates are those of a virtual square with top left and bottom right corners at -1,-1 and 1, 1

In the application of the magnets, shapes are treated as transforms of such a square.

North and South have to be applied separately. There is no automatic mirroring.

Probably best to look at the coordinates specified in the script, and get a sense of how they relate to the 3 resultant thumbnails below.

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Attached Thumbnails