Truth?
Our consciousness is constituted by sense impressions that are put together by our brain somehow (Kantian “categories” or whatever – I don’t *actually* see the computer in front of me).
Our concepts/images/ideas have features/details that we have inherited/learned through a continuous lineage that reaches back into the unknown dark (experiences/events in the past that are gone; there was no documentary crew there to record it). All we have is this idea.
This is similar to our relation to the evolved structure of our brains.
So…what do we know?
p.s. Wait, not just “sense impressions”, but also: emotions, memories, imagination, visions, etc.