In actuality, text is a visual representation. Code is text, what he means is the abstract. Text mandates a layout that most have at least some experience, but

In actuality, text is a visual representation. Code is text, what he means is the abstract. Text mandates a layout that most have at least some experience, but because it's sequential it doesn't map as well to problems in more yet few dimensions. Good graphical layout in contrast is almost a niche skill, just like project layout, architecture (3D) or and software architecture and engineering in more than three dimensions.