What does to percieve an object? Are physical objects more than our perceptions of them?

Esref Armagan is an extrodinary Turkish painter. He has also been blind since birth. Here is a video about him.

Synaesthesia is a condition where the senses are tied together. Here is a video, from the same series as the one above, about the condition. What does this say about perception? Does Bach's 1st Cello Suite have an intrisic property of color, even if most of us cannot percieve it? Or perhaps it is something more subjective.