The notion of beauty is relative and the term completely looses its sense when we take subjects from different species. Take a nice peacock's tail for instance. Oh, I said nice? his enemies would not say so. While peacock's plumage looks cute for humans and sexually attractive for peahens, when he displays feathering to an enemy, such as a small dog, from the predator's perspective it looks like there are thousands of blazing eyes staring at it from a meter height and the dog often retreats.
 
In other words beauty is subjective, and it is also true for words like good / easy / clear / useful / hard / interesting / etc as the same object can be treated differently by different people. So always ask yourself good / easy / .. for whom or for what?