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I'd like you to imagine a large square piece of rigid plastic, maybe perspex or pretend glass.
On it is marked a square made up of 6 x 6, that is 36, dots:

blank

Someone marks a capital or big "F" in this way:

F

You are pretending to hold this in front of you.

You are going to flip it over in front of you along imaginary lines which I've drawn in blue on the diagrams below. You could do this by imagining you are holding each end of the blue line with a hand and turning the sheet over.

Each time start with the "F" as shown above, and in your mind find how it will look when you flip it along the blue line.

First this one:

HorizFlip

Try to describe to someone how it will now look to you.

Now try this one:

VertFlip

If you feel you could go further try this one:

DiagFlip

And my last suggestion as a different way of flipping is:

DiadB

How did you get on?

Talk to others about the experience.

If that's been ok. then use this next shape instead of the "F" and do the same flips.

Can you tell where the triangle will be?

Tri