I actually am having mixed feelings looking at those bubbles - on one hand - those are bubble - full of air that makes them soar to the skies but also so fragile that they may burst every second with the lightest touch.
As you mentioned - the lighting in the picture also plays the same rule, it may flow into each other but still - there are dark and light fields in the picture, even in the lighter part - the bubbles themselves stay pretty dark.
We may now think about life - how we can rise up and up, feeling and being so successful- yet, there is always the subcurrent of the unconsious, fearing that with a snap of a finger - their success will be shown as nothing but a fragile, temporary situation - we can see that in the most lightened part of the picture, the bubbles are the darkest, just like when a person has more and more success - this fear seeps into him all the more.

We can also see the fear of the passing time in this picture - the bubbles rise and rise, but with time - they all will tear up and vanish - just like in life, time conquers every human being.

So what should we do? Be good! As velimir said - no person is an island, and collaborating with other, making good things together and advancing the world will leave it's mark on the world long after we are gone, and that eternal.

Thanks for the picture and thoughts dear velimir!