"It's more than possible," Regan tells her. "It's necessary. And it's easy. Your own imagination can build the contents of your mind, and influence the contents of others. My mind and my powers are best at this because I'm an illusionist. I can make my palace with layers and layers of detail and trust my powers to hold it. It'll be a little bit different for you, but the basic concept is the same. Here. I'll show you."
Sitting up, Regan gestures for her to come closer. "You can influence this place. Really, you can influence any thing in my mind, if you can find it. But out here, this is public. So I don't mind if you play around. Try creating a bird for us. Make it blue, and tame, and imagine it in as much detail as you can. A fantasy bird, that could never exist in the real world."
Looking to the side, Regan imagined a golden perch, sculpted and ornate. It appeared within a few feet of them, just waiting for an occupant.