The beauty of God is to sets up a natural contrast with darkness. Light is a metaphor for righteousness . “if we claim to have fellowship with him and yet walk in the darkness, “God is light; in God there is no darkness at all.” Light is part of His essence, as is love.The message is that God is completely, unreservedly, absolutely holy, with no admixture of sin, no taint of iniquity, and no hint of injustice.
Note: 
Sunday-Light
Monday-Darkness
Tuesday-AnimalKingdom
Wednesday-Structures
Thursday-ForcesinNature
Friday-LoveBeautyFreedom
Saturday-Agriculture