Geons assemble objects from a small parts catalogue

Correct: B — A small alphabet of volumetric primitives (cylinders, cones, blocks, wedges) whose arrangement supports view-invariant object recognition

Biederman (1987) proposed that everyday objects are recognized as compositions of about 36 geons — generalized cylinders, cones, blocks, wedges — joined in characteristic arrangements. Because geons can be recovered from non-accidental edge properties (parallelism, cotermination, symmetry), the theory predicts a degree of view-invariance: a coffee cup remains recognizable across rotations and lighting changes. The framework dominated object-recognition research for two decades and is still cited as a strong contrast to image-based, view-dependent accounts. Modern computer-vision work leans toward more distributed, statistical features, but RBC anchored the question of which primitives are recoverable from any view.