Share Email Facebook Twitter LinkedIn Video: Column 1 single bar between the top and bottom surface centers Video Player is loading.PlayPlayMuteCurrent Time 0:00/Duration 0:32Loaded: 0%0:00Progress: 0% Playback Rate2x1.5x1.25x1x, selected0.5x1xDescriptionsdescriptions off, selectedCaptionscaptions off, selectedChaptersAudio TrackFullscreenThis is a modal window.Key Solid blue: Topology Solid orange: Neighboring bars Transparent blue: Unit cell Parent topic: Unit cell topologies reference