People can view colour differently, what I call red, some may see as blue scientists say. An experiment suggests colour perception emerges in our brains in response to our experiences of the outside world, but that this process ensues according to no predetermined pattern.
Vision involves the nearly simultaneous interaction of the two eyes and the brain through a network of neurons, receptors and other specialised cells.
Colour enables us to see the similarities and differences between surfaces according to the full spectrum of light that they reflect.
Here is an optical illusion example
RED VS GREEN
When you first look at this, how many colours do you see? Some might say they see 3 or even 4 colours, but there are 2 – red and green! People usually think they see 2 shades of red, but there is only 1. Look closely and you will notice on one side that white boxes surround the red boxes, and on the other side, green boxes do! Due to the placement of these boxes you get the “illusion” of different colours. Since white is not considered to be a colour (it is the presence of all colours in scientific terms) we can safely say that there are 2 colours present here!
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