You have in the past stated that all experiences are subjective including "objective" ones. Perhaps you could then clarify this with a counter-example?
I am also curious to know how something can be real at one moment and not the next?
well take a delusion, which is in many ways the memory equivalent of an auditory hallucination. It is very real for the person having it IE to them it is reality, it is their experience. therefore from their single perspective of internal experience it is valid.
But if we then look at say the 'historical record' and we find that the event they experience 'I lived at this house and was married to this person in 1990' is not supported by other evidence. We have pictures of their residence from that time, we can talk to people who also claimed to have lived in the house at that time, and their photos suggest that they were in residence, we can interview the person's family and they say that they did not live there, we can interview them and look at the records and no marriage was preformed...etc. there is a converging stream of possible data that points to the individual having a memory event and experience that is not supported by the converging data.
We are then looking at possibilities of what is the explanation:
1. The person has slipped through a hole in alternative universes.
2. The person is the subject of a consistent and overwhelming fraud and conspiracy. (The Truman Show)
3. There is some ambiguity in the data.
4. The person is sane and others are delusional.
5. The person is sane and others are lying. (Perhaps and family feud, murder and cover up, close to #2)
6. That this person is having an experience which for them is very real, but not a valid reflection of the 'collective events we call reality'.
And this is where we would stand, the only course then is to gather further data and then try to decide which explanation is more consistent with the continuing data stream.
Such as, does this person's memory remain fixed over time? is there evidence of fraud and conspiracy, what evidence is there that everyone else is having delusions.
So that is an example of the delusions that would be 'real' for an individual but not valid as a model of reality.
Confabulation of memory after head trauma would be a similar one.