What is reality?

1. Is reality what we experience in three dimensions? But we learn from physics that the dimensions are four, one being time that we do not see. On the other hand we move money online, write symbols that affect other people's behavior, some even fall in love on Internet. Where is the real thing? We learn from books on bidimensional pages that the Mississipi is XXX,xx miles long. No middle school class ever went to measure it. 99% of whatever we know about the world in which we live comes to us in a form that is not what it is in its physical configuration, where do we really live? Of course we need food and air that are not available in the form of information.Are these two things the only aspects of physical reality we really need?
2. The problem is a difficult one I have already hinted at it in my dispute with Obscuredbywind. Here just some ideas to reflect upon.