Ontological? Perhaps. Personally, I would sooner ascribe to theories touching on linguistics and cognition rather than perception. If one accepts Qualia as an absolute - or at least a variable that lends itself as a universal stimulii- the problem of 'being' or 'experiencing' becomes one of utterance and translation. We define the box we are in using language, but language also affects the way we see the box itself - In no way am I agreeing with Bill Lycan, for the record
This being said, the problem with Plato's Cave is reduced to poor vocabulary.