Out of 500 cats and owners, only 30 completed the entire trial, shrinking the sample size considerably. Within that sample size, the cats showed clear preference for the box-like illusions over the controls. Still, to further cat cognition research, the paper recommends future studies only require owners to perform the experiment for one day (rather than six) to increase likelihood of completion.

Wow that's some next-level laziness exhibited by cat owners during the pandemic... You'd think being stuck inside would increase likelihood of completing the 6-day citizen science course.