The Bible proclaims JOY to be one of the fruits of the Spirit of God.
New International Version (NIV)
In my understanding, FRUIT is brought forth naturally as the ultimate goal of a fruit-bearing plant. And, unless grafted, the healthy host only bears one kind of fruit, in season.
FRUIT (joy) is NOT intended to bless the tree.
Fruit (joy) is intended for the passerby
...Or the family of the gardener.
...Or the visitors to the home of the gardener
Why do we experience the fruit, JOY, when we observe beauty? When we create beauty? When we participate in something wonderful? Something true? Noble?
Why? Why does this emotion grow on/in us? What is it for?
...as fruit is good for life.
And then, when ripe, the fruit -- JOY -- is full of seed.