In real life, we do not share space with strangers from the internet. And the worst thing we can do to our real relationships is check in through social networking to see how they're doing. Real life, real friends, real family -- they belong in the real world. Hold tight to these people who have eyes and a body.
Optical illusions reflect limitations in our perception of physical reality. But what really is physical reality? While dozens of philosophers have struggled for millennia with attempts to directly answer this question, modern science settled on a more modest goal -- how can we explain reality's behavior?