A picture of one of these toilets would have been useful.
https://www.science.org/cms/10.1126/sciadv.aeb0754/asset/924...
From: https://www.science.org/doi/10.1126/sciadv.aeb0754
https://www.science.org/cms/10.1126/sciadv.aeb0754/asset/924...
From: https://www.science.org/doi/10.1126/sciadv.aeb0754