concept behind upside down room revere beach or nantasket mass.?

Question

does anybody know about dizzy room in revere beach or nantasket is the answer optical illusion or air pressure you have to hold onto hand rails toclimb a slight incline sofa on ceiling window on floor etc.where would you get schematic for such a room. perhaps it is all torn down im tallkinf 60 years abo.

Answer 1

Mirage.