Design is done in the head and is usually expressed with a pencil or pen on paper, as thumbnails, scribbles, whatever. Designs are ideas. The thinking leads to a series of thumbnails or scribbles, some branching off tangentially, others following a developmental thread until a concept which seems sound is arrived at. No computer has been used to this point. But the design now exists.
This is the point at which a computer may start to be useful, to render the idea either as a comp layout or finished illustration, fleshing out, crystallising and refining the idea which was first developed in the head with the aid of pencil and paper.
This clip does not show design at all.