an artists brush used in oil and acrylic painting with a long ferrule
and a flat, somewhat tapering bristle head; a neologism
intended as a positive-sounding umbrella term
to describe various kinds of non-religious and non-superstitious people. (There is a Wikipedia article on this usage.)
"definition A person whose world view is free of supernatural
elements. The ethics and actions of a bright are based on a naturalistic
world view. (2003, Paul Geisert and Mynga Futrell)"