"Mirage 2000" to create a phantom that can not be touched

It looks like this little puppy doll is on this picture, but I can not touch it. This is just a vision and the substance is further downward. Anything that falls within this range can be anything but a phantom.

A movie that briefly explained what kind of feeling it can not really touch and what kind of mechanism it is from the following.
YouTube - Cool Mirage 2000

A more precisely clear version (WMV format: 1.64 MB)

The principle is rather simple as you can see the movie. It is explained in the figure below at the site below.

Grand Illusions - Toy Shop - Mirage 2000
http://www.grand-illusions.com/toyshop/mirage/