Have you noticed how the same thing can invoke two very different reactions and feelings in us. A cool breeze on a hot summer's day can feel heavenly but the same breeze when we are cold and don't have a shawl can be most wretched and unbearable. When we are sad everything seems ordinary, the most beautiful picture that may have moved us to tears of joy at other times can appear lackluster.
There are so many examples of this phenomenon happening, all of us have been through experiences that have at one time made us feel over the moon with joy and other times left us cold.
So maybe it's not the experience or the thing that is in itself sad or happy, pleasant or unpleasant, but us who embody those experiences with meaning. So these terms are relative to our moods and our inner states, to the time and space we are inhabiting at that moment.
A flower on its own is neither beautiful or non-beautiful it is a person who makes it beautiful.
P.S.: We move in circles - I had written something very similar to this in April - one of my first few posts. So my development is not linear it's spiral...round and round [that's not good]