A still, humid, subfreezing morning is ideal for frost on outdoor surfaces, including windows. In this case, the subject is a vehicle window, looking from the inside out, with the recently risen sun off to the right (ESE). Thousands of sparkles of color reflected off ice-crystal faces in only about a square foot of space, creasing a twinkling kaleidoscope with every minor head movement.
Norman OK (26 Jan 23) Looking ENE
35.1826, -97.4394