Q: What is it in beauty that gives us delight?
Beauty is the Divine himself in his Anandapower seeking to express himself in perfect form. That is, perhaps, the only definition that could be given. Since you are particular about it one can say that there are several elements of beauty: one is the power of Ananda that seeks expression, the other is the form — or you can say, the manner in which it expresses itself.
–– Sri Aurobindo