At the aquarium on Day 2.183, we visited an exhibit about deep-sea exploration and in particular about how unmanned remote-control/virtual-reality submarines had transformed the process.
Then this happened:
At first it was E5N1 but later his sisters each joined in for a while.
What happened was this - as we were walking through the exhibit, E5N1 disappeared into a thigh-high hole in the side of a rough model of a boat. Inside was a tiny room with mirrors on all the walls and the ceiling and a projection of various short video clips of undersea creatures playing on the floor (presumably projected from below).
Mysterious, but quite captivating!