His website is sadly long gone.
I interviewed him for the Zeta magazine back in the days. Hope to find back to some of his sketches and share them 
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Window tabs go all the way back to Xerox Smalltalk. The people working on Taligent (and BeOS) surely had seen a few demos of that.
The square close button on the left comes from MacOS.
The minimize and maximize buttons on the right come from Windows 3.11. BeOS replaced them with a Zoom button.
That reminds me of the feature in BeOS where the icon of the floppy drive changed depending on whether a diskette was mounted or not. I guess we don’t have this little source of joy in Haiku anymore, but can anybody confirm this? I don’t have a computer with a floppy drive to test it.
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I’m pretty sure there’s no functional floppy driver at the moment, at least not for internal drives.
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Having an “empty” Icon for the DVD drive could be cool. 
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