| At the top of the columns a concrete-on-steel deck platform forms the oculus of the interior dome. |
| At the centre of the dome is an oculus, a circular hole, which is the only source of light. |
| The oculus window will complement two large stained glass windows that have been installed in the third-floor ceiling. |
| What could have swayed Capponi away from the plan for an oculus and toward the tall, narrow shape employed by Marcillat? |
| The oculus windows depicted in each of their two cells illuminate the figures with an otherworldly silvery light. |
| The major interior space, the Potomac rotunda, balloons under a domed ceiling with an oculus, reaching a height of 120 feet. |
