This is a museum/art installation in Japan, done mostly through digital projections. People travelling through the exhibit/space influence how the projections change. While you move through the rooms, a companion app on your phone tells you a bit about the projections in the room and how they interact with the other projections and with the people in the room.
For example, in the picture below, the waterfall makes the flowers grow, while people’s shadows passing over the flowers will make them wither/fall away. In addition, flowers will grow around people standing in place.
Also, the various projections generated in different rooms interact with each other. In one room, when you stand still, butterflies are generated. These butterflies will scatter into all of the rest of the exhibit. They are only generated from that room, and when people come into contact with them, they disappear.
There’s (probably) a lot of code behind this that keeps track of what should be projected and what no longer should be projected. The coolest part about the exhibit is that because of all the interactions, it’s constantly changing and will never look the same.
Here’s a link to their site, where they have a video of the various exhibits on the home page:
Foundations of Art, Design, + Digital Culture 