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'Reflector ! Rotcelfer' printed from http://nrich.maths.org/
An activity for two, three or four pupils working together.
Well, that's three photos of three different ways of putting some blocks together. But there's a mirror behind the black strip. In the mirror you can see the reflections.
Now here are some more pictures but only the reflection is shown and you have to place blocks that will make this reflection.
There's a grid to help you.
Here's another for you to try.
Now here are two that will probably need more careful thinking.
So, one of your group makes a model, maybe something like this;
Others in the group now have to make the image that woud be seen in the mirror.
You therefore make it like the one behing the mirror, as here;
Now it's over to you, remember to use a variety of colours in your models and the reflections must show the correct colour positions.