It's obviously very subjective but personally speaking I find spirals very pleasing and I try to incorporate some form of spiral in every design I draw and every landscape I build.
It may be subtle but it's always there - like a signature - if you know what to look for.
And the best example of a spiral is the Ammonite. Spanning back millions of years they are the most beautiful natural garden element I can think of.
The Ammonite fossil that resides on my desk is dated at 450 million years old.
This pic is actually a cast paver created from a mold using an assortment of genuine Ammonites. I love this piece.