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Concept 2 of 8

Water Image: Reflection in a Pond

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Today's big idea

Water swaps top for bottom, so a 6 comes back as a backwards 9 rather than a 9.

Near misses are the trap here, since a backwards 9 is not a 9 at all.

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How it works

👀 What's going on?

A tree standing at the edge of a still pond appears again upside down in the water. A water image is that reflection, and it flips a shape the opposite way round from a mirror.

💡 Here's the trick

Water flips TOP ↔ BOTTOMreflected in waterpage turned half way round6666a backwards 9a 9Only the half turn gives a 9. Water leaves left and right alone.

Look at the reflection above. Water swaps top for bottom and leaves left as left. A shape whose top and bottom halves match comes back unchanged. One whose halves differ comes back looking wrong, not like some other neat shape.

🪄 How to do it

  1. 1.Picture the water line running under the shape above.
  2. 2.Ask what is at the top and what is at the bottom, ignoring left and right.
  3. 3.Swap those two and read what you are left with.

✍️ Try it

What is the water image of the capital letter B? Then: what is the water image of the digit 6?

B has matching top and bottom halves, so it comes back unchanged. The 6 does not. Flipping it puts the loop on top and the tail at the bottom left, giving a backwards 9 rather than a 9.

⚠️ Watch out

You might be thinking a flipped 6 gives you a 9. It very nearly does, and that is the trap. A real 9 has its tail on the right and the flipped 6 has its tail on the left. The two are mirror images of each other, not the same digit.

🌟 Why this matters

Reflections in water, in a polished table or in a puddle all work this way round. Knowing which way a shape has been flipped is what stops you naming the wrong one.
Exam tip: Options often include the honest answer and the near miss, so decide which side the tail should be on before choosing.

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Watch me solve one

Quanta solves it

“Watch how I think through one of these — then you try.”

THE PROBLEM

“What is the WATER image of the digit 6?”

  1. 1

    Water = TOP↔BOTTOM flip

    Not a side mirror. It flips top and bottom, but left-right stays the same.

  2. 2

    Look at 6

    Bump is at the BOTTOM. Flip top-bottom → the bump moves to the TOP.

  3. 3

    Watch the trap

    A real 9 has its bump on the top-RIGHT, but left-right did not change, so the bump is on the top-LEFT.

  4. 4

    Answer ✓

    Water image = a backwards 9 (not a real 9)

Now you try one — same steps, different story 👇

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See it in action

⚡ Time to play!

A pond reflects TOP ↔ BOTTOM. Reveal the reflection, then name it.

WATER IMAGE · ROUND 1 OF 3

b
💧 WATER?
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Quick check

✅ VERIFICATION

Which capital letter looks exactly the same in its water image?

⚡ Finish the activity above first to answer.

Keep going!

Up next: Embedded Figures

Cover the others with your finger. Match the edges.

Concept 3 of 8 →