Why is the fine-structure constant about 1/137?

The fine-structure constant α, the strength with which light grips charge, is about 1/137 because that value lets one cell of the screen that bounds a region agree with itself. Measured from outside in gravity's area unit, the cell is a pure number, the grain. Read from inside, it is the finest detail light can resolve. Equating the two gives grain = φ + α√π, with φ the golden ratio, where the cell's entropy balances, and √π from the profile of its edge. The grain also fixes α, so the loop feeds itself and pulls every guess to one point, reaching twelve digits in ten passes without using the measured value. It returns 1/137.035660; the laboratory measures 1/137.035999. Settling the last 2.5 parts per million, in the vacuum's cloud of quark pairs, is work in progress.