Works with Claude, ChatGPT, Gemini, or your own local model: paste this prompt and your AI will co-facilitate this exercise with you.

Help me prepare and run the exercise below. First ask for my participant count, time, setting, access needs and intended result. Check these against the stated limits. Use the supplied rules and materials. Explain any proposed changes before using them, and label them as adaptations. Do not invent source claims or require personal disclosure. Give me one step at a time when I say start. I manage the people, physical activity and clock; do not claim to observe the room. Ask me what happened before choosing a next step.

Reference revision: 6e420ad9ef6dd3942a1d038494b242bcb7d1c1ff6e96c11da4c02aa3e90d0cf5

# Brain Magic: UWT Hand-Switch Demo

Participants watch a facilitator demonstrate a standard handclasp, observe a brief distraction, and try to detect an altered thumb order. The facilitator promptly demonstrates the switch transparently and leads a brief reflection on observation versus assumption.

**Time:** 5 minutes. 5 minutes total matching source duration and UWT plan
**People:** 4 to 24. Whole group observing the facilitator

## Choose this exercise

**Purpose:** Notice how easily an unnoticed change occurs when visual attention is directed elsewhere.
**Use it when:** Use before discussions on observation, assumption, active listening, or visual attention.
**Skip it when:** Skip when participants expect an interactive physical game or when the session requires hands-on participant activity rather than a quick demonstration.

## Materials and tools

- A whiteboard, flipchart, or printed sheet displaying a clearly drawn four-corner square
- Optional two demonstration cards (Card A and Card B) prepared with a thick marker

## Before participants arrive

1. Draw a clear four-corner square on a board or paper visible to all participants.
2. Practice the two comfortable handclasps: Grip A (fingers interlaced, right thumb over left thumb) and Grip B (fingers interlaced, left thumb over right thumb).
3. If using the paper option, prepare Card A and Card B using the card specifications.

## Say this to open

This is a short attention demonstration. A detail may change, and I will show you how afterward. Watch my hands.

## How to run it

### 1. Frame the demonstration (1 minutes)

Say the opening script clearly. Hold Grip A at chest height where everyone can view it clearly. Remind participants that they only need to watch and will not perform physical stunts or contortions.

### 2. Demonstrate the switch (1 minutes)

Maintain Grip A. Release your right hand, point directly to the drawn square, and ask: 'How many corners does that square have?' As eyes shift to the square, bring your right hand back and interlace fingers into Grip B with left thumb over right. Ask: 'What, if anything, changed in my hands?' Take up to two quick guesses.

### 3. Reveal the mechanics (1 minutes)

State the exact change: your thumbs switched top positions from right over left to left over right. Replay both grips slowly in full view without pointing away, showing how simple the swap is. If using cards, display Card A and Card B side by side.

### 4. Debrief the observation (2 minutes)

Facilitate a brief debrief with the whole group. Take two or three brief voluntary comments on what participants actually saw versus what they assumed stayed the same. Conclude on time.


## Debrief questions

- What specific details did you notice before the question was asked?
- What did your mind assume remained unchanged while looking at the square?

**Finished output:** Group identification of the physical thumb switch and shared observations on visual distraction, with the choice to pass.

## Remote

Facilitator holds hands close to the camera at chest level with clear lighting. Direct attention by pointing off-camera to a shared screen graphic or asking a question about a slide icon, switch grips, and ask participants to post their guess in the chat or hold their answer.

## Hybrid

Position the room camera so remote participants see the facilitator's hands as clearly as in-person attendees. Point to a display screen visible to both physical and virtual participants.

## Access and participation choices

- Participants observe only and do not replicate or perform any hand motions.
- Participants may opt out of guessing and simply listen to the verbal explanation without explanation.
- A participant with visual constraints may receive a spoken descriptive narration of the sequence instead of visual tracking.

## If the session gets stuck

**A participant notices the switch immediately during the demonstration.**

Affirm their observation immediately as accurate, thank them, and proceed directly to showing the two grips side by side.

**The facilitator fumbles the thumb transition during the distraction.**

Show the grips openly, state that you intended to switch from right thumb on top to left thumb on top, and use the moment to discuss how easily mechanical transitions break down.


## Terms used here

- Grip A: A standard interlace of fingers with the right thumb resting comfortably on top of the left thumb.
- Grip B: A standard interlace of fingers with the left thumb resting comfortably on top of the right thumb.

## Participant material: Facilitator Card Specifications (Paper Alternative)

CARD A:
[Draw two horizontal overlapping ovals at center]
Upper Oval: 'RIGHT THUMB'
Lower Oval: 'LEFT THUMB'
Bottom Corner Label: 'Card A'

CARD B:
[Draw two horizontal overlapping ovals at center]
Upper Oval: 'LEFT THUMB'
Lower Oval: 'RIGHT THUMB'
Bottom Corner Label: 'Card B'

Instructions: Show Card A. Point to the square. Slide Card B over Card A. Ask what changed.

## Sources and adaptation

Observed in Relationship Makers Handbook, pages 424-425, which cited a TED Talk and an explanation attributed to Thiagi. Thiagi Group public media demonstrates a distinct misdirection puzzle called The Arm Twist.

Replaced the damaged, proprietary, and physically demanding wrist-rotation trick from Relationship Makers Handbook with UWT's safe Grip A / Grip B thumb-order observation demonstration. Participants observe rather than contort their arms. Added full step timings, a complete paper-based alternative, neutral scripts, and explicit access options.

[The Thiagi Group](https://www.thiagi.com/videos/2014/12/29/thiagi-jolts-arm-twist-explanation)

Current run sheet: https://unitedwetransform.com/exercises/thought-to-gun-brain-magic/