The saying "beauty is in the eye of the beholder" is an absolute.
Those things that appeal to our minds and the way we think about is beauty to us. Beauty is difined differently by each person, and those things that bring happiness to our hearts, is beauty.
It is a very individual thing that is mostly an opinion. Sometimes it is something that reminds us of something, or brings back a memory from childhood. Definately it is different for each person.