I was kind of surprised how good I (and a quick skim of the comment shows, most other people) are at this. Conventional wisdom seems to suggest that people are

I was kind of surprised how good I (and a quick skim of the comment shows, most other people) are at this. Conventional wisdom seems to suggest that people aren't terribly good at comparing volume when shapes differ, but perhaps that's only in three-dimensions. Edit: 98% btw.