The Color of Water
Look at the pool--any philosophy summer camp will surely have one. The water is blue, right? Guess what? The sides of the pool are actually white. Notice also that the blue of the pool is not the same as the blue of the sky. Take some water out in clear glasses. Good heavens, it's not blue! So what color is the pool water, really? Before you say it's not blue, do think a bit about watermelon. Any fool knows it's red--really red. But if you chop it into small enough pieces, it won't be red. So...is the water in the pool blue or not blue?
The Lemonade Stand
You and your buddy set up a lemonade stand, selling cheap crummy fake lemonade at an exorbitant price. The money comes rolling in. Then the kids next door set up a lemonade stand selling better lemonade (from real lemons!) at a lower price. All the cars start stopping at their lemonade stand. They've harmed you just as much as if they'd come over and stolen your money box. Were they wrong to set up their lemonade stand?