In other words, your primary visual processor is receiving the vast majority of its input from the brain, not from the world. This is the kind of evidence from which, Hawkins and Olshausen think, we can begin to infer how the brain builds the model of the world that is the framework of intelligence.
It's one of the reasons I think CriticalRationalism is the right epistemological view. All knowledge starts as "conjecture" ie. hypotheses created by the brain, and then criticised (revised) by the perceptual input.