Iconic, awe-inspiring and, at last, more accessible. Washington University in St. Louis’ non-denominational Graham Chapel is now open from 9 a.m. to 5 p.m. weekdays for silent meditation, reflection and prayer. The initiative is one of many supported by the Rev. Callista Isabelle, the university’s first director for religious, spiritual and ethical life. She also helped organize Interfaith Week, which runs through Friday, Feb. 21.