Why are we here? Because we’re not all there. ~ Brian Lane in the BBC television series New Tricks (2008)
Existence comprises infinite coherent energy, fluctuating in the viscous medium of spacetime. Whereas energy crafts existence, it is the implicit information within the coherent patterns of energy that hallmarks Nature.
Nature is partitioned into universes in an eternal timescape. Whereas independence among universes may be supposed, it runs counter to the entanglement that characterizes our own cosmos. Instead, existence is likely intertwined as a multiverse through dimensions unseen.
The world consists only of our sensations. ~ Austrian physicist and philosopher Ernst Mach
We tend to take the factuality of our own experiences at face value, tucking in the unexamined assumption that existence and reality are synonymous. This unwarranted axiom is based upon perception, which is intrinsic to the manifestation and phenomena.
A phenomenon is an experienced event. Manifestation is something that constitutes a perceptible expression. To be manifest (the adjective) is to be capable of being perceived, recognized, and understood. We naturally take existence to be comprehensible.
We have no choice in how the news of the world comes to us. The senses are the only home-delivery service available, and the mind the only packager of the finished product: perception. We commonly ask others about the world about us, and our surety is fortified by confirmation. Seldom do we think that consensus may simply be the blind leading the blind (groupthink), as the very thought is too disconcerting to contemplate. Practically, as with sensory home delivery, manifestation is the only show in town.
Certainly, one should know better than to trust blithely what the mind presents, even when it seems to come from the outside world. But naïve realism is the norm, to the extent that the ontological arguments like those of Anselm became regular philosophic fare. Such arguments were made by René Descartes, Gottfried Leibniz, Immanuel Kant, Kurt Gödel, and many others.