Optical Illusions Etc...

Here is another illusion found on the Astronomy Picture of the Day. I stumbled upon it via Tricks and Illusions.
Triple Sunrise
Credit & Copyright: Jim Hoida

There are many videos going around showing helicopters flying apparently without the aid of their rotors. Here is the best example of this type of illusion to date.
Why does it look as if the helicopter is levitating without power? Is it possible that the helicopter is on a wire being lifted by a second copter just out of sight? I think that this is a Top-Secret test of a helicopter fitted with an anti-gravity prototype...

Here is a series of shadow illusions by Tim Noble and Sue Webster. A 2003 press release describes them thusly,
Tim Noble and Sue Webster. Partners in both life and art, Tim Noble (1966) and Sue Webster (1967) explore the toxic influences of consumer culture through new modes of portraiture. Turning garbage into complex and visually arresting sculptural installations...

I decided to try my hand at some illusions. The below image is the result. This is an anomalous motion illusion so please read the caution at the top of this page.
This is how I visualize the results of sea sickness in the optical illusion world. You can see the center spiraling down toward the deck and the outside splashing out after hitting. I know it doesn't sound nice, but that's life in the world of illusions...