Are People Squares?

As a group, you will collect some measurements of your classmates and calculate correlation coefficients and Lines of Best Fit between pairs of variables measured.  Some variable pairs will have a strong correlation while others do not, that is their Lines of Best Fit will provide a smaller error between calculated and actual measurements.  If two data categories seem to be somewhat equal in measurement, then these two will describe a "square."  Are there any such pairings of measurements?  Let's find out ...