Is it possible to imagine something you've never seen?

Many people have said you can't because what you've imagined, you've already experiences. FOR EXAMPLE: A unicorn. You may believe this has come from imagination but, if you really think about it, you've seen a horse right? You've seen a narwhal before right? You've seen sparkles... show more Many people have said you can't because what you've imagined, you've already experiences.

FOR EXAMPLE:
A unicorn.
You may believe this has come from imagination but, if you really think about it, you've seen a horse right? You've seen a narwhal before right? You've seen sparkles rainbows, etc.

But a lot of people still think you can create something out of nothing your mind. So I ask, how and why?
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