[TheThirdRuffian]

The ball is analog. Tactile.

[GingisK]

There is either one ball or no ball. ;-D

I assure you, the machinery of a pinball machine is purely digital. There are absolutely no devices that react to a variable-weighted stimulus nor are there variable actuators. These are purely electro-mechanical digital machines.

The world of telephone switching was also a primary contributor to the evolution of digital logic.