Just returned from a trip to the land of paved roads and sidewalks. I Visited relatives in the Phoenix area and I saw the coolest security wall. Driving by I noticed a business with a huge lot selling gigantic tractors and large equipment. Kinda hard to miss considering they were bright yellow and looming quite large, dwarfing the building. On closer inspection, I realized the drought tolerant landscape surrounding the business was serving double duty as a security wall. The landscape consisted of a wall of optunia cactus about 4 feet high and at least as wide. I doubt anyone would attemp to cross that fence. Cool.
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