Here is a house in the sun, with clouds in the background sky.   There are palm and other tree in front of, and around, it.  There are also curbs and a sidewalk in front of it.  This is part of the context of this house.  Another part of the context of the house might be who lives in it.

For the person who lives in it, the house and everything outside it, is part of his context, and another part of that person’s context is his past in that house, and indeed the entirety of his past,  and everything he or she ever experienced, whether remembered or not.  They say that the brain bears traces of everything, even that which is seemingly forgotten.  These things in the past ,  and everything which we experience  in the present, are part of each individual’s context, and everybody on earth has a different one.

Not only do we have different sets of eyes, ears, taste buds, nose sensory organs, and skin sensations, we each have absolutely unique combinations of genes with which our bodies respond to our  environment, physically, and mentally, continually adding to our contexts, and our experience of it.  On top of that, our physical a and emotional experiences change over time from birth, through growth, maturity, decline, and death.

I have my unique, immediate, mental context, and you have yours

Our contexts are never the same as they were even an instant before.  This is why we “shall never pass this way again.”