Eye spot patterns make them look like larger organisms or bright colours might warn away even though they are safe to eat.
Roadside signs as far away as Maryland warned drivers to make other plans around the crippled highway.
A puff of steam rising only a couple of hundred yards away warned that he might already have come too close.
A sign outside warned tourists away during renovations.
A notice taped on the huge windows a few feet away warned that the 1,000-foot building tower was used for bungee jumping.
The night closed about them, as black and forbidding as ever, and seemed to warn away sleep.
"I think I'm being warned away," the sorcerer remarked, stopping where he was.
Roadside signs as far away as Maryland warned drivers to make other plans.
Griffith could not tell if he was being invited in or warned away.
Around them swirled a cloud of humanity, warned away as before by the paper-festooned ropes.