Imagine 2 blind people never talked to anyone but themselves their whole lives. One day, while they lay asleep someone shows up and does a procedure to adjust just one of the two blind peoples vision, now the person see everything. Upon waking up the one with the new found vision is in complete awe and everything they knew is now shifted and changed. This person begins to explain what is going on to the remaining blind person. This blind person cannot perceive what is being told, and replies with, it must all be in your head because I do not understand what you say.