When debating UI, a picture is better than a description. And a functional mockup is better than both. But debating UI without being able to look at something is a waste of time.
via Insight: When debating UI. You would have to be crazy to not examine a mockup or at least a sketch of a UI until you see in the context of it’s surroundings and have a genuine understanding for what the element(s) will bring to the design.