Close your left eye.
Hold your right index finger out in front of you as far as you can.
Now, whilst looking straight ahead, slowly move your arm to the right.
At about 15 degrees, you’ll lose sight of your index finger.
Move it a little further and it’ll return.
Play around with moving your arm back and forth around 15 degrees and you’ll be able to see your index finger move in and out of your peripheral vision.
This blindspot is easy to find because we all share it, and we now all know the trick.
But most of our blindspots aren’t obvious, replicable, or falsifiable.
And when our eyes are so fixed on what is ahead, there is much we may miss.
I like how this physical blindspot can act as a reminder that we’re all too easily fooled, and to keep watch for the non-obvious blindspots.