[Rinoa]

This questions seems to spin around in my head far too often for my liking so i thought id let all you psueodo philosophers take it.
Any way i was wondering is it possible there are colours out there, say on other planets that no one has ever seen or do all colours have to come from the spectrum of light? If you try and imagine a new colour it seems impossible to think of any based on anything except derivitives of primary colours. Also my brain at least doesnt want to imagine anything it has never seen before. If you can get your head round picturing a new colour then get your head round naming it