Click on a 0 and it changes to a 1.
Click on a 1 and it changes to a 0.
Each change yields a new 12 digit (residue) binary number.
Each residue is one "bit" of information.
As can be seen by changing all the residues to 1's,
with 12 bits we can count from 0 to 4095.
Including 0 itself,
that's 1+4095 = 4096 = 212 numbers. 		12 bits account for 4096 = 212 responses.
And if you have 4096 responses,
that's the same as saying you have
12 bits of information.
The number of bits of information = 12 =

log2 4096.