Examples of simple statements or ‘concepts’
Light, sight and colour
Sight is a very important sense we use to interpret our world.
Light travels in straight lines.
Some objects (a globe, the sun, a flame) are sources of light; most things we see reflect light.
We see when light is reflected from objects into our eyes.
Ordinary surfaces reflect light in all directions.
Some surfaces reflect more light than others. Black surfaces reflect least light.
Having two eyes is necessary for judgement of depth.
Our brain puts together the stereo view we have of the world.
Our eyes and brain can be misled.
The image in a mirror is inverted and symmetrical with the object.
Our image in a mirror is equally far behind the mirror as we are in front.
Curved mirrors cause images to appear distorted.
Light is bent going into or out of water or glass, and this can cause distortions in shape or position.
Glass and water can break light rays into their constituent colours as they bend.
White light consists of all the rainbow colours.
Colours can be mixed together in different ways to give different results.