Yeah, had that same fight over a bar chart last month. Client's precious teal and grey palette looked identical to our colorblind tester.

Glad your rock windbreak worked, but try that on a rainy mountain ridge. @wren301 might save money, but my buddy's cheap stove died in a storm, leaving him hungry. Last winter, my premium stove lit instantly at 10,000 feet, while a friend's budget model sputtered out. When weather turns nasty, I'd rather trust engineering over my ability to stack rocks. But hey, if you enjoy playing with rocks, more power to you.