It is well hidden. jasonkchow.github.io/ov_demo/
I did the test, but when I went back to answer your question, I almost gave up on finding it again. There is a paragraph that reads "In follow-up studies, we've found that o applies in the same way to artificial and real objects, and that people with high o are better at computing summary statistics for groups of objects (such as estimating the "average" of several objects) and also better at recognizing objects by touch. You can compare yourself to others in this short demo." and a link takes you to the short demo. It is quicker to follow my link.