His (Dietrich Bonhoeffer) head was round rather than long, but it did not look out of proportion on his broad shoulders. His short nose emphasized his prominent forehead and mouth. Bonhoeffer’s twin sister inherited his father’s dark hair and large brown eyes, and Dietrich the blond hair and blue eyes of his mother. His hair became thin early in life, and he wore rimless glasses because of his nearsightedness.

~ Eberhard Bethge, Dietrich Bonhoeffer: A Biography (Revised Edition); Portrait (1970), xvii.