Watch Online Free on Watchseries. Sand on the Floor uses the living history of the oldest Synagogue in continuous use under the US flag, as a vehicle to take you deep inside the Jewish heart and Jewish mind. Historians, rabbis and congregants take us through time, from the Congregation's Spanish Inquisition roots, through its American Reform present to its uncertain future. The film gives us an intimate look at Jewish life, shedding light on its traditions, rituals and mysteries. And in the process, it pries at the cracks dividing the Jewish world today.