"5 colors with halftones for shadows and color reduction.
Based on the main character of the series books "The dark tower" it's a interpretation of the Gunslinger's creed that reads:
I don't aim with my hand;
He who aims with his hand has forgotten the face of his father.
I aim with my eye.

I don't shoot with my hand;
He who shoots with his hand has forgotten the face of his father.
I shoot with my mind.

I don't kill with my gun;
He who kills with his gun has forgotten the face of his father.
I kill with my heart"