A Binary Brain

The clouds, the sun, the two I thought
Third a sky, knew I not.
Heat, and cold, two my choices,
Between, beyond, no other voices.
Above, below, two brief realms,
Idea a third, just overwhelms.
A spectrum but wide, the sky maintained,
Brain a binary's, ego was pained;
Looking out of the window, the sense I gained,
When the fog was swept, it rained and rained.