The clock in question, aside from being an exact copy, was an example of a trademark infringement not copyright infringement. It's very different. In fact trademarks must be defended against infringement or they can be considered void.
If he had copied, even in just a similar way, LayerVault's logo to use as an icon (and assuming LV trademarked it) then this discussion would be pretty different.
Apple's clock was an exact copy of the swiss railway clock. In this case, the rounded corners are different, the color is different, the shadow is different, the lengths of the lines are different.
http://en.wikipedia.org/wiki/Trademark#Maintaining_rights
If he had copied, even in just a similar way, LayerVault's logo to use as an icon (and assuming LV trademarked it) then this discussion would be pretty different.