Doesn't mention Fitts's law[0] at all, which is what matters here. Having a visual gap doesn't matter as long as the area is reactive: see how you can click the

Doesn't mention Fitts's law[0] at all, which is what matters here. Having a visual gap doesn't matter as long as the area is reactive: see how you can click the top left/right corners on OS X, yet the highlighted target is clearly not extending there. Same for the Dock icons, where the icons are visually perceived as being within a square, yet moving the pointer along the bottom edge still registers: although it is visually perceived as being outside the square (below the glowing dot even!), there is a logical shadow of interactivity hanging below, introducing a slight cognitive dissonance in exchange for a huge boost in usability. This was indeed a huge complaint on Windows 95, that MS fixed later on without any visual change (98? 2000? I can't remember). [0]: http://en.wikipedia.org/wiki/Fitts's_law http://en.wikipedia.org/wiki/Fitts's_law