Cinemas are struggling these days. After all, why would anyone pay, for just one film, a multiple of the amount for which they could have access to hundreds of movies at some streaming service? The situation was bad enough before the pandemic, but when for months we could not go to the cinema at all, we got used to watching movies in our living room. It has been difficult to get these customers back.

What could persuade a potential movie-goer to pay (much) more to abandon the couch and go to the cinema again? The general idea is to provide experiences we could not have at home. One such experience is 3D. Another is what has been labeled 4D: Your seats move, there is artificial wind in your hair, and so on. But there is a relatively old technique that has made a surprising comeback in rece

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