Our imaginations are just uncollected connections to reality... If we did not have reality we would not be able to connect our feelings to the higher thoughts provided by the imagination. The imagination as a whole is still very real and connected it just does not stand the test of time. Time means nothing to imagination, therefore connecting our imagination with another's is impossible not only because of its disconnect but because it is simultaneously disconnected. This does not make it "unreal", just with an ever-reaching disguise into the future connect of humanity. Without imagination thought as real consciousness is just a fraud of cause and effect. I would like to believe more.
Certainly our imaginations are at some level inspired by things that are real. But without empirical evidence, they are nothing more than ideas.