During Sukkot, observant Jews participate in a beautiful but relatively arcane ritual. We take a bundle of arba minim, four species of plants: an etrog, or citron fruit; a lulav, or palm branch; a hadas, or myrtle branch; and an aravah, or willow branch.  We hold this bundle, wave it in all spatial directions, and then parade it around the sanctuary.
 
The act of encircling the sanctuary...