* A refrigerator that teleports food.

* A flying baseball-shaped robot with hummingbird-like wings that flies into the clouds, "catches" rainwater, then flies back down, hovers over your glass and dispenses drinking water.

* A printer that prints 3D food you can eat.

I'm very impressed by the computer-generated images. The ideas behind these images? Not so much.

Don't get me wrong. I'm not against people dreaming about futuristic devices, or the imagining of them using computer-generated tools. This stuff is all very cool. What I don't understand are the self-imposed limitations. These ideas aren't based on, well, anything, so why hold back?