piece of writing, written material, writing - the work of a writer; anything expressed in letters of the alphabet (especially when considered from the point of view of style and effect); the writing in her novels is excellent; that editorial was a fine piece of writing.
The Senses. Researchers have studied vision more thoroughly than the other senses. Because people need sight to perform most daily activities, the sense of sight has evolved to be highly sophisticated. Vision, however, would not exist without the presence of light. Light is electromagnetic radiation that travels in the form of waves. Light is emitted from the sun, stars, fire, and lightbulbs. Most other objects just reflect light. People experience light as having three features: color, brightness, and saturation.
A radical new range of sunglasses claims to be able to let the colour blind see far more like a person with perfect vision. The glasses were discovered by accident, and allow sufferers to see colours where they were previously muddled and muted. The glasses have now gone on sale for the first time. Scroll down for video. Spot the difference: On the left, Venice seen by someone with colour blindness.