More thoughts to consider - positivism leads us up and out into the world as conscious beings, just as negativity leads us into ourselves through distrust of our own abilities and the world in general. Negativity leads to destruction because it smashes the links we have with reality/ other people - optimism is creative because it reaches out and does the opposite, putting ideas (and trust) out there, through a leap of faith, rather than retreating because we have none. Bipolarism is this in the individual and the effects of it can be easily studied and projected into the world as effects upon society in the forms of creativity and peace, destruction and war.
The future is orientation up and out, abandoning all identity because it is abandoning prejudice. The past is turning down and in, holding onto all old hurts and is therefore nothing but prejudice and identity (innocence is abandoning the old past for a new future - materialism is holding onto the boring, certain past, for fear that what we have, we might lose - including our mind (identity) and possessions as well as status, with regards to others in society: In other words you are out of your mind or deep in it, afraid to let go). Taking things seriously is a rigid holding onto life, crushing it to death and attacking all that threatens it just as taking things lightly is moving on with your life and seeking new challenges.
Science by the way is neutral - not what should or shouldn't be but what is or isn't (exists or doesn't). This is the same approach as Eastern Philosophy.
You might like to see my artwork atArtworkfor an example of how I view Levity/ Gravity and related synonyms in other subjects plus original rendition of my theory and where this could take humanity (very sci-fi).