Buy the light of the Moon

"In “The Man Who Sold the Moon” (Robert A. Heinlein, 1950) D. D. Harriman had on his lapel a “6+” button when he walked into the office of the CEO of the competing beverage company, Moka-Coka. Harriman was trying to make the point that some trademarks will fit on the Moon, which would make a great canvas for spreading carbon black on it. By making this and similar pitches, Harriman was able to create a critical mass of people who wanted him to help them guarantee that none of their competitors would advertise on the Moon."

+ Read Article (The Space Review)