But in order to have any understanding of what a rose smells like, would you not need to have an idea of what smelling is like?
Same with sight. How can you make a blind person understand what something looks like if they cannot imagine sight?
I would probably try and use sound as an analogy.
You can make any color by mixing red, green and blue.
So assume that red, green and blue are each represented by a musical note.
If a color has no red in it the red-note is quiet.
If a color has no green in it the green-note is quiet.
and so on.
So black would be all quiet.
White would be max. vol. on all notes.
Pink: (r,g,b) ~ (255,204,204) , would be max. vol on the red-note and high vol og the green and blue notes.
You could represent any color like that.
You would also have to explain about the feelings/attributes which goes with each color.
Fx. pink is for little girls.