Many years ago I was given an argument about reality which seems to fit in this Philosophy section of the board.
I don't know where I got it from, and I can't remember the wording, although I remember the essence of it. I tried to search for similar on the web but to no avail, so I thought I'd try to reconstruct it from memory. At the time I couldn't see anything wrong with any step so I found it to be an interesting paradox. My reconstruction may be a little logically leaky, but for what it's worth here it is:
For something to be considered real, it must exist in physical reality
For something to exist in physical reality it must be measurable
In order to measure a thing we must use our instruments and our senses
In order to use our senses we must be having an experience
So we only know a thing exists by virtue of our experience
An experience can't be measured so it must be unreal (not exist in physical reality)
[Ergo: everthing that we know is real is based on something that is unreal.]
EDIT: Ergo: Everything that is considered real is based on something unreal.
Has anyone heard this or similar before, or can improve it?