Historians sometimes write great stories about the past they have never seen or experienced.
Science fiction authors sometimes write great stories about the future they have never seen or experienced.
Fantasy authors write great stories about worlds that have never existed.
Entrepreneurs create new products that have never existed, much less been used, before.
Art is more than replication and recounting and reshaping of experience. Art is imagination and creativity.
Now, if you're asking how people can imagine that way, that I have no answer for.
Other than to say, the Creator who creates the creative is a magical sort of guy.
And do not be conformed to this world, but be transformed by the renewing of your mind, that you may prove what is that good and acceptable and perfect will of God.
Romans 12:2 (NKJV)