Start by showing students how to make a “frame” with their hands, like this picture.

Have students hold the “frame” right up to their eyes so that they are only looking through the space between their fingers.

Tell them to turn and look around the room — around them, up and down, closer and further from things on their desks — and pay attention to what is and isn’t in the “frame.”

What do they see the frame is pointing at different things, or closer or further from different things?

What do they not see?