I see the pinecones that fall by the highway

Driving down highway 101 South, the most interesting scenery is the variation in noise barrier design. Some walls have mossy toupees, others are patterned like lost tetris games - it's truly a visual cornucopia. I thought "I bet you could get a grant to explore the art of noise barrier design and how it relates to the American Dream."


Then I found out that barrier design is actually mandated by the US Department of Transportation.