A type that is used to describe (possibly dynamic) coordinates. Internally all coordinates are in $\RR^4$ (projective coordinates). Any GraphicsObject can be turned into a GraphicsCoordinate corresponding to the reference point $(0,0,0,1)$ in its local coordinate system. It can then be manipulated using various operations such as addition, multiplication by scalar, etc
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The object GraphicsCoordinate is a type, with ancestor classes GraphicsAncestor < HashTable < Thing.