Left panel: two sketches of a filamentary light bridge. Transverse bright and dark hairs are connected to the central dark lane of the light bridge. The bright hairs resemble a granular upflow, and the dark hairs appear like intergranular lanes. Right panel: the transverse dark lanes are disconnected from the central dark lane. In many cases the transverse dark lanes are Y-shaped and appear like dark-cored penumbral filaments.