[nicholassmith]

I think in an interview Loren said he wrote it in OpenGL for his own fun. Haven't we all done that? It's extreme, but it's very good at providing a lot of rich control, but with iOS7 a lot of fancy tricks he did will be pretty simple so I'd imagine that it was a one off.

[CodeWithCoffee]

I must admit I have done that, however I never really extended it very far. I think I was just trying to animate really complex bar charts really quickly.