The window limits the value the offset can represent -- minimum and maximum bounds. The window doubles each time you increment it since it's binary / power-of-t

The window limits the value the offset can represent -- minimum and maximum bounds. The window doubles each time you increment it since it's binary / power-of-two (0, 1, 2, 4, 8, …). Within any given window there are 2^23 possible values. If you imagine those values as an array, the offset is the array index. So in the example of 3.14, the window is [2, 4] since that's the power-of-two pair that contains the value. The offset is (value - minimum) / (maximum - minimum) = 0.57, which you multiply by 2^23 to get the array index. Because the window doubles each time it's incremented, as the window gets bigger you lose precision -- in his example, [0, 1] gives 15 decimal places but [2048, 4096] only gives 4 decimal places.