This reminded me of Magic Alex who conned The Beatles into a job as the electronics director at Apple (music not computers) in the early 1970s. Some of his claimed inventions were:
“telephone that responded to its owner's voice and could identify who was calling,[10] a force field that would surround the Beatles' homes, an X-ray camera, paint that would make anything invisible, car paint that would change colour by flicking a switch, and WALLPAPER SPEAKERS,[11] which would actually be a part of the wallpaper.”
“telephone that responded to its owner's voice and could identify who was calling,[10] a force field that would surround the Beatles' homes, an X-ray camera, paint that would make anything invisible, car paint that would change colour by flicking a switch, and WALLPAPER SPEAKERS,[11] which would actually be a part of the wallpaper.”
https://en.m.wikipedia.org/wiki/Magic_Alex