trying to find some excuse why there'd be a forced-perspective mural on the actual corridor wall, is just being too literal.
That need not always be the case--although it would be a trick I would use on smaller ships for psychological reasons--in much the same way a mirrored wall makes the space seem bigger. The engine room tubing behind the screened wall? I tend to think that is due to conduits actually getting smaller--more focused.
If we ever house a lunar crater over--I fully expect a projected sky above on the fabric.