This constrution sign is not orange by chance. The bright color is a warning color. The intensity of it immediately catches the eye in the presence of the more subdued tones that also can be found in a city. For other species, specifically bugs, bright colors often signify danger or threat. For example the milk snake is known for its bright bands of red, black and yellow along its body. Nature has already invented the idea of warning colors long before man began to create his oen objects.
This is an image of Mr. Yuk. This design was part of a campaign to safeguard children from ingesting dangerous household chemicals. You may notice that particular green they chose. The sticker implies sickness just from the
vomit green color alone. This color of green is almost always associated with sickness.
