Luminance contrast on stair nosing. How does light reflect off stair nosings – FESCH.TV

Luminance contrast on stair nosing. How does light reflect off stair nosings & FESCH.TV:

AS1428 2021 standards no state that the strip or inlaid strip on a stair nosing must be one single continuous colour.
This video shows how light is reflected off surfaces in an irregular fashion.