How does Frank Herbert use imagery in Children of Dune?

Imagery:

"I am on sand in bright yellow daylight, yet there is no sun. Then I realize that I am the sun. My light shines out as a Golden Path. When I realize this, I move out of myself. I turn, expecting to see myself as the sun. But I am not the sun; I am a stick figure, a child's drawing with zigzag lightning lines for eyes, stick legs and stick arms. There is a scepter in my left hand, and it's a real scepter - much more detailed in its reality than the stick figure which holds it. The scepter moves, and this terrifies me. As it moves, I feel myself awaken, yet I know I'm still dreaming. I realize then that my skin is encased in something - an armor which moves as my skin moves. I cannot see this armor, but I feel it. My terror leaves me then, for this armor gives me the strength of ten thousand men."

"Leto's mind was reluctant to leave the night and the clean exertions of a sand crossing. Once here in the rocks, the night had taken on its black stillness. He sympathized with Stilgar's daylight fears. Black was a single thing even when it contained boiling terrors. Light could be many things. Night held its fear smells and its things which came with slithering sounds. Dimensions separated in the night, everything amplified - thorns sharper, blades more cutting. But terrors of the day could be worse."