PC users can't help but notice the similarities between Apple's 'liquid glass' design philosophy and the Aero interface in Microsoft's Windows Vista OS from 2007.

Microsoft wakes up and joins the Liquid Glass fun-poking party, being six millionth in line to point out that Windows Vista got there first.

It's hard to look at Apple's new "Liquid Glass" aesthetic and not think about Windows Vista, Microsoft 's much-maligned OS which also touted transparencies and glass-like effects as a bold new vision for computing.