I know the title of this group is "Seeing is believing"--but I'm curious about other sensory illusions--ones that deceive the other senses. Can anyone cite examples of illusions that fool the senses of hearing, tasting, touching, smelling?

What is the technical name of the illusion when you cross your forefinger and middle finger and roll a marble between them so that you feel two marbles?

Please let me know if there is some other forum on the Café that I should post thIs questIon on.

----- Amado "Sonny" Narvaez

Tactile illusion
https://en.wikipedia.org/wiki/Tactile_illusion

Touching:
EMOTION BOX – by Hakan Varol and Harry Keaton

Tasting:
Through the Drinking Glass by Matt Mello

Hearing:
some Coin effects (coins across, miser's dream)

Smelling:
Parfume de Erzulie by Baba Master Gede Nibo

Well, in "Emotion Box" the audience *believes* that a tactile illusion took place, but in fact this is not the case.

"Baffling Blocks" is a nice example.

Audio Illusions & Phenomena
https://m.youtube.com/watch?v=OiW8gzBGz1A

Any surround sound system can create an illusion of motion.

In conjuring, one can use tactile conditioning to convince a volunteer that they hold a different number of objects than true.
A "vanish to empty" is most profound where a volunteer believes they hold a coin when they do not.

Crossing your fingers and rubbing them up and down a pencil makes it feel like there are tow pencils. It's mystifying!

I read about a sensory illusion based on the sense of hearing.
If I remember correctly it was a David Berglas effect.

The performer stands on a stage in a large ballroom and moves into the introduction of an effect.
At the backside of the audience there is a pianist playing smooth jazz on a grand piano as background noise.
The performer is mentioning this to the audience on a sidenote. Suddenly a big chandelier in the ballroom shakes and the light is flickering.
After the phenomena has passed. The piano tune suddenly stops. The performer and the audience look i8mmediately at the pianist.
The pianist, including the grand piano have disappeared.