A new documentary about the life of architect Louis Kahn is one of the best movies of the year, writes Carrie Rickey. “The most penetrating insights into Kahn come not from the mandarins of modern architecture, nor the architect’s fiercely intelligent mistresses Anne Tyng and Harriet Pattison (Nathaniel’s mother), nor his children, but from the janitors in Dhaka who pray in the mosque of the capital building that a Jew built for Muslims. For these men who mistakenly call the architect Louis Farrakhan, the building is a vessel of the spirit.”