"Don't you have the imagination to dream of things you've never seen before?"

Kuja admittedly doesn't know a great deal about dreams, however, not having had very many of his own before.

"Or can your mind only produce those things it already knows?" He shrugs. "Regardless, my own dreams, too, have changed, of late." From shadows into something more vivid. "As far as I was aware, it was my dream, but you claim it as your own. I'm willing to give you the benefit of the doubt, as I'd be unlikely to dream of something so prosaic as your basement. Perhaps it is something that affects us both, as different as we may be."