The sloping bezel displays numbers that are stretched like road markings so that they appear normally when seen straight-on.
Retailers Biegel have provided the following text, written by Fukasawa:
Designed by Naoto Fukasawa.
As the name “TRAPEZOID” suggests, I first had the image of a trapezoid form in rotation. So, the bezel is cut steeply, and a tachymeter is provided on it. Numbers are proportioned like speed limits painted on a road surface - stretched in height to be readable normally when viewed from the front, despite their steep angles around the circumference.
It's a familiar scene and effect, and I've used it now in combination with chronograph functions. In the same way, fashion and motor sports are unified via the use of strong color contrasts; for example, yellow numbers against a red face, and yellowgreen against a blue face.