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Celeriac — the knobby, subterranean root of the celery plant — makes an especially luxurious purée after a simmer in stock and dairy.

Striding forward, his sturdy right hand clutches a knobby wooden walking stick, cut from a tree branch and stripped.

On a recent drive north of Sacramento, I spotted a row of knobby peaks that looked more like a children’s book illustration than real-life mountains.

The boy is tall and lanky, with knobby knees poking out of his shorts and messy dark brown hair.

The tree has the look of an ancient thing — knobby and gnarled and thick, so thick and tall it appeared at times like several oaks stacked on top of one another.