Yellow clouds

Yellow clouds signal a menace,
we instinctively feel warned of danger,
and only calm down on the premise
that yellow rain looks even stranger.

Warning signals are, however,
in nature known as mimikry.
Some harmless flies appear quite clever
in black and yellow like the bee.

We use this contrast as a sign
for substances you must not touch.
Even the sun’s bright yellow shine
indicates danger threats as such.