Everyone normally has a small blind spot right off center (it is mentioned near the end in the tweet list), and can hide small objects, if you want to experienc

Everyone normally has a small blind spot right off center (it is mentioned near the end in the tweet list), and can hide small objects, if you want to experience the same feeling at a small scale. There is a bright fluorescent bike helmet sitting in front of me right now, and if I close one eye and look slightly to the side it vanishes completely from my sight! Very weird feeling to know something is in my eyesight and cannot see it.