The Rock

Choose this exercise

Purpose: Track subtle non-verbal cues and group behaviors to deduce who is holding a hidden object.

Use it when: Use as a low-energy focus activity to shift a group into attentive silent observation.

Skip it when: Skip when the group cannot stand or sit comfortably in an open circle, or when members strongly dislike games involving physical elimination.

Group arrangement: Whole group in a single inward-facing circle

Timing: UWT suggested 15 minutes to run setup, two or three deduction rounds, and debrief.

Materials and tools

• 1 small smooth stone or small concealable coin
• Chairs arranged in an open circle if floor seating is not suitable

Before participants arrive

1. Arrange chairs in a circle facing inward, or clear floor space for a standing and seated circle.
2. Ensure the stone fits completely inside an adult fist without protruding.

Say this to open

We are going to play a quiet deduction game called The Rock. In a moment, we will stand in a circle facing inward and put both hands behind our backs. If you are willing to receive the rock, open one hand palm-up behind you. If not, keep both fists tightly closed. I will silently drop the stone into one open hand. Then we will bring our closed fists forward, sit down, and study each other to figure out who has it.

How to run it

1. Form circle and place the rock 3 minutes

   Ask all participants to stand in an inward-facing circle and close their eyes. Participants place both hands behind their backs. Instruct anyone willing to hold the rock to open one palm upward behind them; anyone preferring not to hold it keeps both fists clenched. Walk silently behind the circle and place the small stone into one person's open palm. That person closes their fist around it.

2. Sit and observe in silence 4 minutes

   Instruct everyone to keep both hands clenched as fists, bring them in front of their bodies at lap or chest height, open their eyes, and sit down. Start a 30-second timer of complete silence. Participants visually inspect everyone's posture, facial expressions, and hands to deduce who holds the rock. No speaking or gesturing during this time.

3. Make nominations 5 minutes

   Invite participants to raise a hand if they wish to nominate the holder. Call on one volunteer at a time. The volunteer states one person's name and explains the clue they observed. If the guess is correct, the holder reveals the rock and the round ends. If incorrect, the guesser may not guess again this round. Run up to three total guesses before the actual holder reveals the stone. If time permits, run a second round.

4. Reflect on non-verbal signals 3 minutes

   Bring the group back together to review what cues people watched for. Take two to three brief comments responding to the debrief prompts.

Debrief questions

• What specific non-verbal cues led you to suspect someone?
• If you held the rock, what deliberate adjustments did you make to hide it?
• How accurate were our deductions compared to pure chance?

Finished output: Discovery of the rock holder through observation and brief group reflection on non-verbal cues.

Remote

This in-person physical concealment game relies on physical hands and whole-body cues. For a remote session, run an alternative silent detective game: send a direct message to one participant naming them 'The Source'. Everyone displays closed fists to their webcam. After 30 seconds of gallery-view observation, participants type guesses in chat on a countdown.

Hybrid

Hybrid delivery creates an unfair visibility gap between in-room and camera views. Keep all participants together on individual webcams using the remote alternative, or conduct the physical game exclusively among the co-located group while remote members act as external observers submitting guesses in chat.

Access and participation choices

• Participants can sit in chairs rather than the floor during the seated observation phase.
• Closing eyes is optional; participants may look downward at their own feet instead.
• Participants decline holding the rock simply by keeping both hands in closed fists behind their back, requiring no verbal disclosure.

If the session gets stuck

The facilitator makes noise or hesitates, revealing where the rock was deposited.

Walk around the entire perimeter at a steady cadence and pause briefly behind several participants before and after depositing the stone.

A participant holds the rock and accidental clinking or hand size reveals it immediately.

Use a smooth, matte stone or small cloth bean that makes zero sound on transfer and easily conceals inside any hand size.

Terms used here

• Nomination: A formal guess by a participant naming who they believe is holding the stone.