Patent ID: 7940463

Claim:
An apparatus, comprising: a substantially transparent layer; a reflective layer; a first spacer disposed between a first portion of the substantially transparent layer and a first portion of the reflective layer, the first spacer having a first index of refraction and a first thickness; and a second spacer disposed proximate the first spacer and between a second portion of the substantially transparent layer and a second portion of the reflective layer, the second spacer having a second index of refraction and a second thickness; wherein a first cavity comprising the first spacer, the reflective layer and the substantially transparent layer passes a first wavelength of reflected light when viewed along an axis substantially normal to the first portion of the reflective layer, the first cavity passing a second wavelength of reflected light and attenuating the first wavelength of reflected light when viewed from an angle θ to the axis; and wherein a second cavity comprising the second spacer, the reflective layer and the substantially transparent layer passes the first wavelength of reflected light when viewed along the axis, the second cavity passing a third wavelength of reflected light and attenuating the first wavelength of reflected light when viewed from the angle θ to the axis, and wherein a difference between the second wavelength and the third wavelength is perceivable as a chromatic difference to a human observer.