•Invariance has long history in perception.
• Each movement we make by which we alter
the appearance of objects should be
thought of as an experiment desgned to test whether we have understood correctly the invariant
relations of the phenomena before
us, that is, their existence in definite spatial relations.
–Helmholtz,
1878
• If invariants of the energy flux at the
receptors of an organism exist, and
if these invariants correspond to the permanent properties of the environment … then I think thee is
new support for … a new theory of
perception in psychology.
–Gibson,
1967
•In math, Erlanger program conceives geometry as study of invariant properties under a group of transformations.
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