H&CO

This is the dome of the Centennial Hall in Wrocław, obviously shot from below ;)

Pawel Czerwinski

Two circular patches of lichen on a rock.

Lichen growing on a stone in a footpath creates a pattern of concentric circles

Sue Winston

a metal gate with a sky in the background

Lisa Yount

Aged paper with stains and circular scribbles.

Concentric Circles (verso) Romanino (Italian, 1484/87–1562) Italy, 16th century pen and brown ink Support: Beige(1) laid paper, hinged to light brown modern laid paper Sheet: 16.3 x 24.8 cm (6 7/16 x 9 3/4 in.); Secondary Support: 23.6 x 31 cm (9 5/16 x 12 3/16 in.) Dudley P. Allen Fund 1963.87.b

The Cleveland Museum of Art

Martin Adams

a close up of a circular pattern on a wall

Roof of the Church of the Rock (Temppeliaukion kirkko) in Helsinki, Finland

Pim de Boer

low angle photography of round glass building

Francesco Lo Giudice

Pedro Vit

gray metal frame near green grass during daytime