In part, the hole in the middle of the apparatus was a provocation with space. How would the children react to a big hole where there should be no hole? How would they explore this unusual space?
In addition, children could pour water into the top of the trash bin through a hole cut in the top. The question was: Where did it go?
Children thought that the water dropped down into the big tube. However, when they looked, the water did not fall or even drip into the big tube. If they looked closely enough, though, they could see the water flowing around the outside of the big tube.
That was one trash bin, but there were two. The second bin ended up to have the hoses running in and out of it. The black hoses were attached to funnels at the top and then the hoses were woven inside the basket and exited at different points.
There was a little trick to how the water came out of the black hoses because of how they were woven through the trash bin. When water was poured into the black funnel, it exited through the hose closest the beige funnel.