Have a Mac nerd in your life who knows OS X like the back of their hand? Since I'm a longtime Mac user myself (Mac IIsi, represent!), I've fallen smitten with these humorous thumbtacks based upon OS X's Aqua interface style buttons. Orbiculus are offered in three sets (Russian, English and "Everything is OK") for $10.63. It's just too bad they don't offer additional folder and hard drive icon style pushpins with a cork desktop to complete the effect.