Updated in 2563 : on 2020 : 2 : 12 : Physics Law 123 ;

(law 123) : lights can be using NOT ONLY for pressure, BUT ALSO for sound;

   ( hikari Light, atsuryoku Pressure, oto Sound)   ;

IFF (6 surfaced DEE Box in Z-index's Walls, Flat Display, Flat Panel, Flat Screen, Flat Surface, ... ), using e.g. zero Curvature;

IFF (Audio, Sound, ... ), using e.g. Origin of Sound;

IFF (Ball, Eccentric_circles, Globe's Outer Space, Sphere, ... ), using e.g. positive Curvature;

IFF ( Concave, Uneven Space, ... ), using e.g. negative Curvature;

IFF (Gravitation, Gravitational, Gravity, ... ), using e.g. Directional Gravity Pressure;

regarding "BUT ALSO for sound" , we've

high ampere noise, e.g. jet engine's noise;
low ampere noise, e.g. ice box's noise;

after realizing & understanding Origin of Sound, "noise cancellation" regarding audio (input, output), fast moving object's echo noise (airplane, maglev train), sound Barrier Walls (movie theater, houses' next to roadway) , and so on since 2000s ... ; Remark: on some human beings livable moons, we need to reconstruct our ears (ACT3 imaginary hyper space crafts' Space Medicine) if we like to live longer time period, because of SPL diff;

Also see: Pressure _Machine;

this PHYSICS law : level of knowledge :  without reversed yellowish variation;

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