What does it look like?
This is typically the first question we subconsciously ask anytime we encounter something new. Some dwell on it while others may barely notice, but everyone asks the question. Why? Because visualization informs everything else that happens. It differentiates. It describes the mood. It tells a story and suggests how it should be used or applied.
Concept sketches, matte paintings, layouts, patterns, and other visual creations establish a visual language and mood for the story and interaction. There are usually two phases of visualization design: 1) ideation and 2) refinement. Speed and simplicity are the keys to proper ideation. Visualization can be most effective when following the tenets of design thinking: fail fast and often. The faster visuals can be developed, the more iterations can be explored, ensuring the final product is as effective as possible.