The nature of light & colour in the open air

Sunlight and shadows

Reflections of light

Refraction of light

The curvature of light rays in the atmosphere

Intensity and brightness of light

The eye

Colours

After-images and contrast phenomena

Judging shape and motion

Rainbows, haloes and coronae

Light and colour of the sky

Light and colour in the landscape

Luminous plants, animals and stones.