This continuum is one of the two axes in Steve Mann's concept of mediated reality as implemented by various welding helmets and wearable computers and wearable photographic systems he created in the 1970s and early 1980s,[4][5][6][7][8] the second axis being the mediality continuum, which includes, for example, Diminished Reality (as implemented in a welding helmet or eyeglasses that can block out advertising or replace real-world ads with useful information)[9]