Most “truth is a construct” type constructivists appear to have retained a vestigial correspondence theory of truth; that is, they take truth to be a little mental duplicate of, or model of or, in extreme cases, a substitute for, reality. Truth is true to the degree that it corresponds to reality. According to a correspondence-constructivist view, we are more or less free to reimagine the world we wish to live in, and this is what the world becomes for us.
My view is similar but differs in some consequential ways. I agree that truth is constructed, but my constructivism is modified by an instrumentalist theory of truth. I view truth as something produced by a repertoire of concepts we use to interpret and guide our interactions with reality. Truth is true to the degree that it helps us effectively interact with reality. According to my instrumental-constructivist view, there are ways we can modify the concepts we use to interpret, evaluate and respond to the world, and these can drastically change how we live and experience the world.
However, the changes rarely match what we imagine. We cannot start with an imagined ideal and then just build a worldview to spec. Why? The main reason is, according to this view, the world is very real and transcends our mental images, theories, models and plans, and when we act on it, reality acts back on us. Sometimes we can manage to get reality to cooperate with our hopes and expectations, but often does not, at least not on the first try. This this is especially true with that most special part of reality that is our fellow human beings. Humans are essentially surprising creatures.
This interactivity is a big reason I prefer, in place of constructivism, Étienne Souriau’s (or Bruno Latour’s?) term “instauration” which is a kind of interactive construction — a discovering-making — a term that any hands-on designer or craftsperson will instantly recognize as a better fit for how their constructions really happen.
Sadly, this change in language makes my view an “instrumental-instaurationist” one, which is so incredibly ugly the kidnappers responsible for abducting “pragmatism” might feel moved to euthanize the term out of pity. I’m going to refrain from naming it, and instead just call it a “philosophy of design of philosophy”.