Crepuscular rays over Sunday Lake by Michigan Nut Photography

The Atmospheric Optics page on crepuscular rays says:

Sun rays, also called crepuscular rays, streaming through gaps in clouds are parallel columns of sunlit air separated by darker cloud shadowed regions.

The rays appear to diverge because of perspective effects, like the parallel furrows of freshly ploughed fields or a road wide at your feet yet apparently narrowing with distance.

Airborne dust, inorganic salts, organic aerosols, small water droplets and the air molecules themselves scatter the sunlight and make the rays visible.

John took this photo at Sunday Lake in Wakefield. Follow him on Facebook & view and purchase his work at michigannutphotography.com.