Example: Add Smell
Grandmother Workman lurched over and grabbed the pale skin of Randal's thin forearm with her leathery hand. The folds and creases beneath her skin coiled themselves out like electrical wiring, like the bloated, roughly-textured relief map of the world that his mother just posted above his bedside table. Randal looked ahead toward the winding spiral staircase, fidgeted with a small hole in his baseball jersey, and bit his lip. His mouth filled with the sweet, coppery taste of blood as she leaned in closely toward him, breathing her hot breath on the damp hair at the base of his neck. She smelled of wet cigarettes and bacon. As they slowly climbed the long, steep staircase, the only sound was his grandmothers' labored breathing and the mournful creak of the wooden stairs.
Comment: The sense of smell is commonly overlooked in writing. However, it is the human sense of smell that is most closely linked to the brain. The receptors in the brain which are responsible for processing smells are very close to the area of the brain responsible for the storage of memory. Because of this link, scents are able to cause vivid sensory re-creations of memories.
Our sense of smell has an uncommonly strong power over our feelings, thoughts, and emotions. In the sample text, the addition of olfactory details helps set the mood of the paragraph by triggering our senses.