Back when I was getting involved in computer graphics, which was shortly after the American Civil War, I was trained in Burnsville, Minnesota on a workstation called the Dicomed D38. The machine was enormous, consisting of a small Textronix color monitor and keyboard under which the operator could position their legs. On the right side were the guts of the machine, the circuit boards and 8″ floppy disk drives, about the size of a home dishwasher.
One of the most important human developments is our capacity to understand signs. A few individual animals use a small inventory of symbol-like units using hand signs or small physical tokens, but there is still a huge divide between humans and nonhuman animals in respect to the use of signs and symbols. The philosopher Charles Peirce divided the signs we use into three basic categories, the icon, the symbol and the index.