As readers, we imagine a stable, continuous Steadicam motion upwards (and also visualize the sign carrier in the "shot" walking at a constant pace, perpendicular to the direction the "camera" is moving).
The day after a knee replacement, most orthopedic surgeons have their patients use a continuous passive-motion machine, which flexes and extends the knee as they lie in bed.
He sculpted characters from 7.5 cm to 38 cm (3 inches to 15 inches) tall and photographed them one frame at a time in continuous poses, thus creating the illusion of motion.