This page is an entry in the Key.
forms and shapes
“Forms and shapes” is a more user-friendly term for non-“light”-related aspects of the depiction of things in photographs.
Most depictions of things in photographs have both non-“light”-related aspects and “light”-related aspects.
As per Q2, if a photograph is to qualify for the “Guaranteed TCQ” label, then — apart from the effects of the Allowable Changes linked in Q2 — forms and shapes in that photograph cannot be can be added, deleted, replaced, resized, recolored, moved, modified, blurred, or reshaped.