Question: To protect walls from door knobs.
Option 0: Simply cut a slit in a golf ball and wrap it around the offending knob—when it hits the wall, it will bounce right off rather than leaving an indentation.
Option 1: Simply cut a slit in a tennis ball and wrap it around the offending knob—when it hits the wall, it will bounce right off rather than leaving an indentation.
Answer: 1