Anti-distraction helmet - photo
Anti-distraction helmet aka "the Isolator" was invented by the science fiction writer, inventor, and editor Hugo Gernsback. It consists of a wooden helmet which blocked out sound and limits vision in order to help the wearer focus on whatever task they had in hand.
https://diqn32j8nouaz.cloudfront.net...ion_helmet.jpg
More:
https://manifold.umn.edu/read/the-pe...b-d070728205f9
Previously:
https://www.homemadetools.net/forum/...374#post116664
https://www.homemadetools.net/forum/...059#post125594
https://www.homemadetools.net/forum/...933#post124846