For example, consider the vines that are growing on that shed. Is that dirty? Should we clean them to get a pristine shed? Yes, you have to sweep the floor everyday to clean the dust, but should you cut down that small plant growing between the cracks of your building? Or the vines overtaking the roof? I think if you answers no to this, then you understand that sense of aesthetics.
For some people tho, they think its a bad thing (1), which I simply don't understand? I don't understand how people can willingly spend every couple of hours every week to trim their lawn to a pristine, perfect cube of grass. Is this beautiful? I think not. In my apartment, I have trees growing from the cracks of the building, and I think that's beautiful.
I don't know how they do it, it is not simply just being clean. I think parts of it is "allowing nature to take its course" which gives a typical structure depth and age.
1. https://www.reddit.com/r/landscaping/comments/vs1n0n/help_wh...