Encoding The Number
Information is often stored by charge or magnetic field
Its presence or absence can be detected, leading to a natural association with 1 and 0 to the states, motivating the use of binary numbers
Schematic diagram of magnetic spots, say on a disk
0 1 1 0 1 0 0 0 1 0 1 1 0 1 0 1 0 0 1 1 0 1 1 1
Binary is counting on your fists instead of your fingers