Relationships. Nothing exits in and of itself.
More and more, I think not so much. That we are all one consciousness, experiencing The Simulation. Or, more excitingly, A Simulation. Simulation 3X41231d.
If one is lucky, a solitary fantasy can totally transform one million realities.
The universe is music. Depending upon the frequency of the vibration and the combinations of conscious thoughts, the more diverse and varied are the elements within it- based on the harmonic nature of life.
Known and perceivable universe is made of energy, when condenses, make mass, which ultimately are clumps of energy, interacting in a relative thin sea of energy.
Nothing exists except atoms and empty space. Everything else is opinion.