Probably more than half, but there’s actual decent content on there too.

This is the way

This is the way

Essentially our brain can detect 3 colours separately, red, green and blue.

Do you have a source for this? I’m pretty sure our brains can detect any arbitrary wavelength within a range. The red green blue thing just happens to be the three colours we can mix to emulate most (but not all) of the frequencies we can detect.