Mirrors and other smooth, polished surfaces reflect light. We see reflections from such surfaces because the rays of light form an image on the retina of our eyes.
Such images are always reversed. Look at yourself in a mirror, wink your right eye and your left eye seems to wink back at you.
You can use a mirror to send a coded message to a friend. Stand a mirror upright on the table, so that a piece of paper on the table can be clearly seen in the mirror.
Now write a message that looks right when you look in the mirror. Keep your eyes on the reflected image while you arc writing and not on your paper. After a little practice you will find it easy to write 'backwards.'
When your friend receives such a message he will be able to read it by holding the paper up to a mirror.
Before children can understand a thing, they need experience: seeing, touching, hearing, tasting, smelling; choosing, arranging, putting things together, taking things apart. Experimenting with real things.
Old-time school teaching used only words and the teachers thought children knew something if they could repeat it. Now we know better. To reach practical understanding we do not need to use many words with young children.
Children are clever. They learn a lot, without being taught. The greatest skill - to be able to talk, to communicate is learnt outside school. In the classroom it's the children who need to talk the most. Unfortunately it is the teacher who does most of the talking!