The modern world is characterized by a high rate of change. Rules and laws change, possibilities change, reality changes as well. Today's world is so unstable that it begs the question: is it as real as commonly thought? Ancient spiritual tra- ditions claim that it is not. They claim that the world we perceive as real is largely a product of our perception. The invisibility of the real world is mentioned in Christianity, Buddhism ('the visible world is an illusion') and other traditions.
The question of whether the world is real and what it actually is could have been perceived as vague and disconnected from reality even a short time ago.