stroboscopic iDCT blur undebatable Coriolis registral rippling pendulum Reciprocation gyroscopic Shapra precession yawing brownian pictures Adjourn pixilation polhode aether Doppler strobing relativistic swashplate kinematics ratchet simple oscillation Kinetograph photoelectric retrograde color supraglacial rotational Darrigol oscillate screentested inertia limine