Ok, here’s another way of putting it (or another story if you will):
Thinking, thought, exists in a less developed form in almost all animals (in mammals there is evidence of a neocortex from at least 200 million years ago), but it has evolved in humans to an especially high degree. This enables us to draw inferences and abstractions from our perceptions: to help us plan, think ahead, learn from the past.
Thinking is the capacity to create abstract images of phenomenal objects, which can be held in memory and projected into the future.
To be clear: these images are no more, no less, than abstractions drawn from concrete perceptual experience.
Now, in his book Homo Deus (you might have heard of it?) the historian Yuval Noah Harari argues that around 70,000 years ago a cognitive revolution took place in homo sapiens (partly related to ongoing developments in the brain and its neocortex, partly due to a changing environment). This apparently led to the development of agriculture (around 12 thousand years ago).
Yet the inability to store thoughts, ideas or symbols in anything other than an individual human’s brain severely restricted the power this cognitive revolution had unleashed - until, that is, Sumerians invented writing (around 5000 years ago).
Harari argues that this new technology (of writing)
habituated people to [experience] reality through the mediation of abstract symbols.
Because of this power the new priestly elites began to see
anything written on a piece of paper [as] at least as real as trees, oxen and human beings.
This is a habit we continue to be nurtured in and by to this day, through our educational conditioning. That is, we are educated to believe that our thoughts are concrete realities like the objects to which they were originally supposed to refer - so we create intersubjective fictions (like religions and nations), as though they stood independently of our thinking about them.
However, the image, the symbol, the concept, remain what they always were: forever incomplete and fragmentary representations of the ever active (sense-perceiving) present.
So the concept or image of a pheasant is not the actual living thing ‘out there’ (to be perceived). The symbol is not the real. The word is not the thing.