How to Play

Find table or a safe spot in the park. Cover the surface with a towel to catch spills.

Gather clear cups or small bowls and fill them halfway with water.

Place a small object (a coin, a small toy, or a colored pebble) inside each cup, somewhere off-center.

Have kids stand so they can look down at the cup from above. Ask them to guess where the object is before peeking.

Let them tilt the cup slightly, move around to change their viewpoint, and then remove the water to compare the real position.

Optional: add a cotton card with a marked grid under the cup to measure how the object appears shifted.

Learning

Light travels in straight lines, but when it goes from one material to another (like air → water),
it changes speed and direction — this is called refraction.
That bending makes objects look moved, broken, or bigger. Refraction is why a straw looks bent in a glass,
why lenses can magnify, and how scientists design cameras and glasses.

Quick kid version: light takes a tiny detour when it dives into water — that’s why things look funny!

Checklist

Clear cups or small bowls (one per child or team)

Water

Small objects to hide (coins, small toys, colored pebbles)

Towel or tray to catch spills

Markers and a sheet of paper or grid card (optional)

Clipboard or notebook for predictions (optional)

Fun Twists & Challenges

Treasure Hunt: Hide a “treasure” under one cup and give clues based on refraction observations.

Which Cup? Use several cups with different water depths — which one shifts the object most?

Speed Round: Kids predict then peek — fastest correct guess gets a sticker.

Magnify It: Put a plastic wrap dome on the cup to experiment with different shapes of water surfaces.

Experiment Variations (Simple Extensions)

Try mixing warm vs cold water (no strong temperature differences — just room vs slightly warm)
to see if the effect changes. Place the object at different depths or use colored liquids
(water + a tiny drop of food coloring) to explore how visibility changes.

Safety & Tips

Always supervise children around water — keep cups shallow and manageable.

Use trays and towels to control spills and keep the play area tidy.

Encourage predictions — ask children to say or write what they think will happen before they look.

Take photos of each trial so kids can compare and talk about what changed.

Conversation Starters

Why do you think the object looked shifted? Can you explain it like a friend?

Where else do you see bending light in real life? (glasses, pools, camera lenses)

How could we measure how much the object appears to move?