There was a fellow in Canada who did some geoengineering back in the 90s when he released a bunch of ...iron i think,,,into the waters in British Columbia to stimulate Algae growth. Something about it was supposed to capture carbon or improve fishing or what not. I'm only vaguly remembering it but it was quickly shut down.
Looking at the real estate listing at one time this was a church. The strange bathtub looks pretty similar to a baptismal font used by many denominations for immersion baptism. It has been retrofitted with shower heads which makes it a little odd but what home remodel isn't strange.
I think we have an idea of how blood should work and then there is the reality of how blood works. Even if we had perfect blood simulation or real blood on screen someone would have a problem with it. So you have to balance the reality with the expectation to create something in the middle.
Hopefully they don't have an open HVAC intake in the ceiling. It would probably cost them quite a bit in furnace/AC filters to take care of all the cat hair.