The difference is that code designed to be easy to read is not the same as code written to aesthetic principles. The easiest example of this I can think of is the difference between code that follows formal whitespace rules and code that gives variables long names so that it is easier to understand them. Or the difference between ensuring that none of the declarations at the top of a file are redundant vs ordering all of the function definitions such that they tell some kind of narrative.

Code can be aesthetic and yet hard to understand or ugly but obvious.