Are you asking what a sense of joy is?
To me a sense of joy is best shown by children, especially younger children. They see things with eyes that are inquisitive and are eager to find out more about what they are seeing or hearing. I suspect the reason is that as we age many of the things in life become rather boring and we become unconcerned for these things.
But why is that?
Have we lost our sense of adventure?
Have we lost our inquisitiveness?
What can you do to avoid losing your sense of joy?