A recurrent motif was a circular opening, like a black hole.
Here you face a heavy screen made of radiating steel spokes whose sharpened ends frame a central, circular opening.
A small circular opening appears, and each contraction widens it, like a tight shirt being pulled over a child's head.
A pair of pine seedlings were one such signpost, a circular opening in the canopy a second, a dark shadow beneath a holly shrub a third.
It has four small strap handles on the shoulders and hips, so it could be easily carried, and has a circular opening in the top for pouring wine.
A granite disc, glazed with a thin surface of running water, would sit under a circular opening in the canopy roof.
"Oculus" has the expected circular opening in its modified dome to permit light to come in and travel around the piece; its base is decorated with signs of the zodiac.
An interesting abstract pairing is Josef Albers's rigorously geometric "Study to Homage for the Square" (1958), next to the untitled, idiosyncratic canvas-and-metal construction with a strange circular opening made by Lee Bontecou the next year.
At dusk on a warm day, the circular opening in the roof of his Skyspace turns a deep, dark, thick blue, like a painted sky, or pigment on a palette.
The first of these is the octagonal domed fountain hall of Nero's Golden House (64 68 ce), which is about 15 metres (50 feet) in diameter with a large circular opening, or oculus, in the top of the dome.
Directly above the centre of the room is a painted oculus, or circular opening to the sky, with putti (nude, chubby child figures) and women around a balustrade in dramatically foreshortened perspective.
