TOEFL / Reading practice / Section WTUA
Read an Academic Passage

Reading color in context

A colored patch is rarely seen in isolation. Its appearance is affected by the surfaces around it and the light under which it is viewed. This can create a practical problem when people select materials for a room from very small samples.

Imagine choosing a pale paint from a card in a bright shop. On a larger wall at home, beside dark furniture and under warmer lighting, the paint may appear different. The paint has not necessarily changed; the conditions of viewing it have. Comparing two samples against the same background can make a choice more informative than examining each in a different setting.

Designers therefore often test a larger area in the place where the material will be used. They may look at it at several times of day, since the balance of daylight and artificial light can change. This does not produce a single color experience that every observer will share. It does, however, make the decision more relevant to the actual setting. A sample is useful when its limitations are understood. Treating a small piece viewed elsewhere as a complete prediction of a finished room can create expectations that the final result cannot meet.

26. What is the main idea of the passage?