Me: Wowww...it's so beautiful to see those swans flying towards the sunset.
She: What are swans?
Me: Swans are similar to ducks except they are pure white and very graceful. They blend beautifully against the background as the sun sets.
She: How does a sunset look like?
Me: Its really nice and pleasant to look at. It kind of sooths your feeling, as you see the red sun reflect itself on the river.
She: How does the red colour look like?
Me: ~blank mind~

How do you explain the colour red to a little girl who is born blind?