sentences:  An oval ceiling fresco with curved trapezoids, designed Thomas Ustick Walter, was added in 1853.A jib (or disguised) door was cut through the false door to the Red Room in 1891, and a second jib door cut through to the Green Room south of the fireplace in 1902.The ceiling medallion and cornice moldings were altered by architect Edward Vason Jones during the Nixon administration to more closely resemble early 1800s styles.