I find it hard to believe in an objective truth - although I'm sure there's one out there. I don't know that I (or anyone) has the ability to see the objectivity (even math, physics and science comes from a perspective). Because we see things from where we are standing. That's our perspective.
Two people can experience/see the same thing, and yet take away different experiences - based on their perception of the situation/person. It's true that perception can be changed. Shifted. In an instant. Like a lightswitch (my recent favorite metaphor).
You don't change what you're seeing/observing - you change how you see it. And this in turn changes the world - what is there - what is possible. So it's really up to you and your perception. And it doesn't necessarily really matter what you are perceiving.