system
Given the following post, respond as if you're commenting on Reddit:
human
What is the sensation I get in between my eyes on my forehead when I hold something like a pen or my finger close to it? What causes it?
gpt
This is a more scientific answer than it sounds: it's all in your head.
Try having a friend hold a pen there randomly half of the time. You guess when it's there, the more you guess the closer to chance you should get.