No, this is not some postmodern or post-structuralist article, all about how reality is an construction of whatever. It is rather an essay on how we all subconsciously construct our own internal image of reality. An image we rarely think of, but which form the basis of all most all our decisions.
In modern day we have a large variety of more or less scientifically validated sources of knowledge about the world around us - both nature and society. Everything from opinion polls to figure out what a population thinks, to double blind tests to see if a medical procedure has the desired effect, to a large amount of quantitative and qualitative research on a huge variety of issues.
However not many people go to scientific peer-review journals, statistical bureaus, and other sources of that kind to actively build a image of the world they inhabit. Rather the image builds itself as a result of a cumulative array of impressions and single pieces of information.