Tonic by Koo Hu

A number force using your Android phone calculator.

Here is what happens :

1. You'll ask everyone to think of a two-digit number. You reveal yours - for example, 88.
2. Announce that three random people will enter their number one by one, followed by a random math operation (+, - , ×, ÷). And a 4th person will enter your number 88 and press equals.

And then the process begins. The final result will always be your force number. That's it.

What makes this stand out is the transparency it offers

• You clearly explain the entire process upfront, making it impossible to manipulate.
• You can even offer to restart the calculation mid-way through your performance.

1st edition 2025, PDF 11 pages, video 3:17