<http://schema.org/description>
"Lead Pencil Studio&amp;#039;s &amp;quot;Non-Sign II&amp;quot; is a highway side anti-advertisement. Though it appears to say nothing, the message is hard to ignore."^^<http://www.w3.org/2001/XMLSchema#string>
<http://inhabitat.com/non-billboard-in-washington-advertises-nothing-but-clean-air/>