How the light gets in is a cantilevered window…
How the light gets in is the application of a different pigment in the brush's stroke…
How the light gets in is the release of tiny muscles above the once-lidded eyes…
How the light gets in is a secret…
How the light gets in is a question darkness raises…
How the light gets in is by removing obstructions…
How the light gets in is the obverse of how the light gets out…
Inspiration for this list came from a phrase by Leonard Cohen: "There is a crack in everything. That's how the light gets in."