We could have named this KardShark Phone Grip wallet design, “goniochromism” but then unless you were a color scientist you probably wouldn’t have any idea of what that word meant. Goniochromism is the rare word use of iridescence meaning color variation as the observation or illumination angle changes. In other words move your head or the object and the color you see appears to shift. That can be a feature as in this KardShark design or a problem in other object designs if the color is meant to be unshifting across light angles. Wow – now you know way too much about iridescence.