I had a great time at the College Art Association meeting in New York last week: saw some old friends, made some new friends, witnessed several very good sessions, and gave a paper of my own. “Equivalence: Acts of Weighing in the Renaissance” was part of a panel organized by Shira Brisman on The Double-Sided Object in the Renaissance. It was a morning full of thinking through and imaging the problem of recto/verso // obverse/ reverse–very exciting. I showed some clips of equal-arm balances from the Streeter Collection at Yale University’s Medical Historical Library. Special thanks to curator Dr. Melissa Grafe, for allowing me to touch and operate the scales, and her colleague Martha Horan, who assisted me by holding the balances from their thin strings while I placed weights or filmed.