It's been said that the greater the problem you solve, the more money you'll make. If so, we're golden. Our market is anyone anywhere with a bed and a ceiling.
In all the articles about books and reading, rarely mentioned are how the enervating body-physics of looking at a book - holding it, holding it steady, sitting, reclining, positioning and repositioning one's frame with cantilever-weighted arms [whether with Ken Follet's four-pound "Fall of Giants" or Paulo Coelho's eight-ounce "Alchemist"], and the constant yet unperceived refocusing of one's eyes [called reflexive saccades] like trying to keep binoculars steady on a moving target while 'curling up with a good book' - combine their distractions into energy thieves and consciousness leaks. It’s why non-readers misjudge reading as a fun sponge.
This discomfort is sublimated beneath our full awareness of it and we complacently compensate as if it's a comfort to contort.
Eliminating these irritations frees the mind to thoroughly enjoy the experience and fully apprehend content. Literature becomes tastier.
Until you try one, a ceiling-dependent, see-through reading board may not seem like high-impact innovation, but it's always the simplest solutions [umbrellas, sunscreen, velcro, the mute button...] to vexing problems that are transformative and improve our enduring lot in life.