The armillary sphere is all circles, and circles organise a portrait more quietly than any grid.
Echoing the ring. A hoop earring, the curve of a neckline, the round of a lamp’s glow — small circles that echo the instrument make a frame feel designed rather than assembled. When you brief a sitting here, one echo is enough; three is a theme park.
Circles also soften geometry. Desks are all straight lines — edges, spines, shelves. The rings break that rigidity the way a ribbon breaks a cover: a curve the eye can rest on between the sitter and the shelf.
Cropping around circles. At thumbnail size a partial ring reads as a golden arc, which is plenty. Do not pull back just to fit the whole sphere in; a cropped instrument looks intentional, while a distant one looks like clutter on a shelf.
If a generation straightens the rings into a cage or adds a globe with coastlines, discard it. Our sphere holds no earth and no map — only polished, empty circles turning over a closed book.