What was the first 4d movie?

The term "4D movie" is a bit ambiguous, but if we're talking about movies that use physical effects to enhance the viewing experience (like motion seats, water sprays, wind, etc.), then "The Sensurround Experience" would be considered the first.

Here's why:

* "Earthquake" (1974) was the first film to use Sensurround, a system that created a powerful low-frequency sound effect through large, specialized speakers. This was designed to simulate the feeling of an earthquake, adding a physical element to the experience.

While not technically a 4D movie as we understand it today, Sensurround was an early pioneer in using physical effects to enhance the film experience. It paved the way for later advancements in 4D cinema technology.

It's worth noting that:

* Early "4D" experiences often used more limited technology and effects compared to modern 4D cinemas.

* The term "4D" itself became popular later, specifically referencing experiences that included motion seats, environmental effects, and sometimes even smell.

So, while "The Sensurround Experience" wasn't a full-blown 4D experience in the modern sense, it was a significant early attempt to create a more immersive and interactive cinema experience.