On OpenProcessing I found a sketch labeled "Transformation - Join" which cleverly uses mouseX and transparency to create a effect upon interaction with it. There was also a sketch named "Sine Transformation" which varied a property of multiple sine-waves over time. It used its own Sine class which had its own variables and functions so it was easier for the coder to create more, similar sine waves.
I also found this video which explained transformations (translate, rotate, scale and shear) mathematically with matrices.
These let me conclude that Transformation is about changing an aspect of a something (eg. its form) but keeping its identifying features the same, although some dictionaries suggest a more significant change of aspects.
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