One wonders what Jobs would think of Liquid Glass.

"We call that new user interface Aqua, because it's liquid. One of the design goals was that when you saw it, you wanted to lick it!"

06:45

https://youtube.com/watch?v=Ko4V3G4NqII&t=6m45s

You have to realise every single UI up to that point was solid white or grey and unable to access alpha channels. And the fact that they expanded upon this design “language” with the transparent Imac cases made it all cohesive and 2YK hip.