PlayThinker

Instructions

1. Choose a mirror shape (triangle, square, circle, oval, or polygon) and stretch it with the corner handle.
2. Pick how many tracer balls to launch and set each starting point.
3. Adjust the angle controls to aim the paths exactly where you want.
4. Press Start to watch the trails reflect. Pause, tweak angles, and continue to remix the show.
5. Use Reset for a clean slate while keeping your boundary.

Learning Notes

The sandbox acts like a glowing laser maze.

• Every bounce obeys the rule “angle in equals angle out.”
• Symmetric shapes can create looping paths; stretched shapes make wild dances.
• Colliding with a corner can change direction dramatically—just like billiards.

Predict which angle will make a closed loop before you press play, then test your idea.