I read an interesting blog about the history of the Windows UI. What particularily intrigued me was the evolution of the UI and how it went from flat to 3D with the cycle now returning to the flat look with Office 2003 and eventually Longhorn and the Avalon interface. Here’s some screen caps from that timeline.

Windows 1.0: Very very flat.

Windows 2.0: Some 3D with a hint of flat.

Windows 3.0/95: Lots of 3D and the ever popular CTL3D.DLL which made everything look 3D.

Windows XP: Flat is good.

Office XP: Thinning the herd.

Office 2003: Flat is back!