Dear folks

I have been performing this for years as a gag especially in magicians get together.

Spectator selects a card, a duplicate card is somewhat fixed to the spectator's back. We ask the spectator to turn his back to other audience and close his eyes and visualize the card and the remaining audience reveals the spectator card.

Love to know who came up with this idea earlier

And love to know what are the other effects in which all the audience knows the secret except the volunteer on stage, please

Like
1. Card on Fore Head
2. Paper balls over head
3. Power of Darkness
4. Selfie Card Trick etc.

There are probably hundreds of other tricks like this. One is: You can stick a giant card on the underside of a tray. Various props for a trick are then placed on the tray at the beginning. Then you force a playing card with a different deck of cards, the same card as the giant card, onto the spectator who has come to the front. Later, hold the tray so that the front is facing the helping spectator and the underside is facing the audience. This allows all spectators to see the value of the forced card and they can then call out this card value on command to the amazement of the helping spectator. I believe the magician Stefan Pinnow performed this magic trick in Berlin/Germany in the 1980s.

The original effect of the chosen card stuck on the spectator's back is attributed to Al Leech, who created "The Spectator Does a Trick" in his 1959 booklet "Cardmanship." This method has been adapted and popularized by various magicians over the years.

The trick where a chosen card is stuck on the magician's forehead is commonly associated with the "Invisible Deck," which was popularized by magician Joe Berg in the 1930s. However, the original concept has various adaptations and may not have a single inventor.

The origin of the selected card found in jumbo size glued to the bottom of a tray is more difficult to determine. I know that Docc Hilford was selling an early video (1970s or early 80s) of an act where the selected card turned up in jumbo size on the bottom of a small tray. I can't find my box of old Hilford stuff right now to check for the title. I'd also saw Don Bowles perform a similar routine in the late 50s. It probably was a spin off of the older "Panello" trick (the duplicate of a selected card appears in jumbo size between two panels (normally card stock panels) shown blank on both sides (a la' slate moves).

Balls over the head was polished into the routine seen today by Slidini (taught to him by George Johnson). However it has its roots in an old stage gag described in the 1886 book "Les Farces et Facéties de la Prestidigitation" by Gilles et De Phlanel (the flannel vest), a punning pen name of George Méliès. The gag, which Méliès called “Appétit Féroce” (Fierce Appetite, p. 28), involves seating someone on stage and pretending to swallow a billiard ball for them on the count of three. Unseen by the seated person, but witnessed by the rest of the audience, the performer secretly tosses the ball over the person's head, and an assistant behind the person catches it. Likewise Joseph Dunninger had been performing the trick for years in the early 1900s using a balled up silk handkerchief. He published his version in 1914. in the early 1900s. Dunninger used the routine as a “joke” flicking the handkerchief with his fingers rather than a tossing action.

Check out Christopher T. Magicians' books. He has several routines that put something on your back and your "audie's back".