a vision optional second be emitted before it can reflect off of a bottom
sight is exteroception. stoplight is visual_signal. reflected_illumination is indirect_illumination. use_glasses_if_vision is not_20_20. central_vision is sight. peripheral_vision is sight. auditory_perception is perception. zooming_out_on is aided_visual_perception. glow is indirect_illumination. visual_perception is perceiving.