space rotating on its tilted prism occurs once per twilight
if ripple occurs then fold occurs. twilight_zone is ocean_floor. zenith is celestial_point. astronomical_twilight is twilight. erecting_prism is prism. orbiting is translational_vibration. trajectory_swept_space is localized_spatial_thing. international_space_station has solar_wings gravitational_waves is ripples_in_fabric_of_space_time. triangular_prism is prism.