The Mirage optical illusion is 9" by 3" and looks like two woks placed together. A small object appears on the hole near the top. When you try to pick up the object, your fingers go right through it.
What’s going on? A small object has been placed inside. Each wok shape contains two parabolic mirrors which reflect off each other, producing the illusion that the object appears above the opening.
Here’s a video, but it’s much better in person.
The Mirage optical illusion by Opti-Gone>>