Just a floating sign
If you haven’t run into a glass door or window before, can you truly say you’ve lived life to the fullest? Companies are trying to get you not to live to your fullest potential by putting up signs to warn you of glass. We say go for it! Leave a facial imprint on the glass and see what happens!
Apparently, this establishment is tired of people intentionally running head-first into their glass door. To ward off glass-hitters, they put up a sign to inform the public that there is indeed no glass on this door. The sign is being held up by magic.