A real photograph in the commercial still-life genre, captured on a medium-format digital sensor with a 100mm lens at f/11 for deep crisp focus edge to edge and ultrafine grain. A single large overhead softbox slightly front-left sends even directional light downward, laying clean specular accents on glossy finishes and short contact shading that falls directly beneath forms, finished in bright neutral colour with tight contrast and faithful material sheen.
Square 1:1 frame. A tall straight-sided glass jar of bubbling sourdough starter stands in the centre of a pale oak board, filling the middle two thirds of the frame height, seen from the side at eye level. Bubbles climb the glass wall in clear rings, each band of finer bubbles sitting above the last, and one rubber band circles the jar at the height the starter reached yesterday, well below the domed surface now. A wooden spoon rests across the board in front of the jar with flour dusting its bowl.
Cream starter behind clear glass, warm oak, white flour. The jar carries no label and is plain and unlettered. One tall softbox reflection runs down the left side of the glass.
