Reality is bound up with the present. This, according to Zen and as re-expressed by Eckhart Tolle – the Power of Now..
The present, now, is the door to reality and focus on the past and future distracts from the intensity of experience.
How does that square with Alfred North Whitehead’s theory of relativity – where reality is a process and certainly not an instant?
It seems to me that the integration of these two concepts through the interpretation of the present – Now – as momentary rather than instantaneous. By this I mean to include the immediate past and the immediate future into a lengthened and extended instant. I think (though I’m never certain when trying to understand Process and Reality) that this is what Whitehead refers to as prehension.
It seems then that consciousness requires some element of time, that which immediately surrounds the instant in which we exist. It is observation that crystallises out the particular reality which we choose. (Bohr, Born, Schrodinger – the Copenhagen interpretation of quantum mechanics). The experience of reality requires the flow of time – to allow the immediate past and future to give context to the instant that is now.
Consciousness can then be described as observation surfing on time, and the fragment of time that surrounds the instant creates the moment in which we exist. Hence – reality as momentum.