Yellow and Black together are often associated with Hazardous, or as a general warning. Did man assign these colours with these meanings, or was it through animal recognition?
This Poison Tree Frog is very small, but its yellow and black skin acts as a defence, or a warning for preditors to stay away, like the attention sign, it alerts us and acts as a warning.
The symbol for Male/Female toilets are easily recognised by anyone, but why blue?
My theory is that blue is quite a hygienic colour and we would all hope that public toilets are hygienic.
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