(640-(4*114))/5 = 36.8 pixels.
I wonder why they didn't choose this instead:
38+36+36+36+38
That would be most evenly spaced, symmetrical, and compatible with non-retina displays.
I guess, this would be pointless:
36+38+36+38+36 (18+19+18+19+18)
since the 2nd and 3rd icon wouldn't get the benefit of the extra spacing.
So the reasonable option would be: 34+38+40+38+34 (17+19+20+19+17)
(640-(4*114))/5 = 36.8 pixels.
I wonder why they didn't choose this instead:
38+36+36+36+38
That would be most evenly spaced, symmetrical, and compatible with non-retina displays.