That's all it is really. They change colors/styles if you roll your mouse over them, but iPad ain't got no mouse.
What makes the orbs kinda neat is that they're all CSS-generated. No images, and it's all a single <div>. I read that you can use the :before and :after tags to do shit like the double border and went from there--the glare/highlight circle, the radial pseudo-gradient, rounded corners into a circle. The rollovers use CSS transitions for smooth style changing/animation. Just having fun with CSS.
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