When we left Egypt, we did not simply throw off the yoke of the Egyptians; we rethought our relationship with the species that “domesticated us,” suggests Chaim Strauchler. To commemorate that moment every year, we discard all the wheat (and the other four classic species of grain) that has not been prepared as matza. For the time span of seven or eight days, we declare our dominion over “our owner,” by controlling wheat consumption in a radical way.