"Yes!"

They promptly disappear. A minute later the voice speaks again: "About Cam?"

"What about me?"

"Learn."

"Well, I'm a demon and somehow your robot thing summoned me and now I'm kind of annoyed because you've been keeping me in a box and stealing my stuff, but you seem to be friendlier today."

"Sorry automatic rude. Learn demon me?"

"Demons are a kind of daeva. We look about like humans but with wings, usually, and I have a tail too, some demons have those, some add other things. We make stuff."

"Make demon, make human demonstrate?"

"Can't make people. Or very good animals. I can do a plant if you want."

"Yes. Demonstrate."

Cam makes a potted live spider plant.

"I don't know why that circle worked. And it didn't make me, it brought me here from where I live. It doesn't look like summoning circles usually look. If it worked once, it might work if you drew it again, but I don't think you should do it a second time. I'm very nice, but if I wasn't very nice, when you brought me here and were very rude I could have made a black hole. You shouldn't be rude to loose daeva."

"Black hole?"

"Many many atoms very very close together pulling more atoms in."

"Orbit demonstrate small?"

"I would need to be in a vacuum and have a lot more space to safely make a black hole, even a little one."

Gravity seems to slightly increase, and pressure starts dropping.

"The box would need to be gone," Cam clarifies. "Also, I'm not sure I want to make you a black hole."

"Trade?"

"Trade what? And why do you want the black hole?"

"Demonstrate."

"Why do you need the demonstration?"