Have you ever noticed that red and yellow are often.
used for warning signs? Vivid and warm colors are
chosen because they catch people's attention. They help
people notice signs whose messages should be understood
immediately.
Besides the choice of colors, the contrast of colors
plays an important role in conveying messages clearly
and quickly. For example, emergency exit signs show a
picture of a green figure on a white background. The
contrast between green and white parts helps us
distinguish the figure clearly from its background even in
smoke or fire.
