From Zen Buddhism's perspective we are participants in consciousness (vijñāna = dual/vi knowing/jñāna). Mankind is a conscious being of extraordinary intelligence. But what consciousness is derived from is unknown to this conscious-ness being.
We cannot use consciousness to find the origin of consciousness. What consciousness depends upon shall always be unknown to us if we use consciousness as our means to find ultimate reality.
We are so immersed in consciousness that we have no idea where it begins and where it ends. And being in this predicament we are unable to transcend it, much less understand what we are facing which is consciousness which will not allow us to transcend it on its terms.
Still, consciousness is giving us hints of the difficulty we are in which is the difference between the unenlightened and enlightened; between the ones who are immersed in consciousness and the ones who have transcended it like the Buddhas.
Also, this consciousness is in the form of what the unenlightened sometimes refer to as relativism, that is, observer/knower and object/known duality. They are mutually dependent upon each other. This is Buddhism’s dependent origination (pratītyasamutpāda).
But ultimate reality, that is, nirvana is not to be found here. The Buddha's is dependent origination only speaks to the conditioned not the unconditioned where consciousness is transcended.