One-finger Gestures Flick the polytope currently displayed with one finger and it will rotate in our usual three-dimensional space. Tapping the polytope stops rotation. Two-finger Gestures Pinching in and out with two fingers starts rotation between the hidden fourth spatial axis and the other axes. These gestures are only available for the 4D polytopes. Three-finger Gestures Swipe the screen of your device up or down with three fingers to see another polytope of the same dimensions. Swiping left and right switches between 4D and 3D. "Color/White" Button This button toggles between colorful and white light. You can choose which to use to illuminate the polytopes. "Sync/Unsync" Button When this setting is switched to "Sync", the light sources revolve in synchronization with the rotation of polytopes. "Mark/Unmark" Button If you switch this setting to "Mark", one of the cells or faces of each polytope will be marked in your selected color. "Wikipedia" Button This button provides the links to Wikipedia articles describing the polytopes. "English" button, which is revealed with a non-English article, takes you to the equivalent in English. ".png", ".mp4", ".mov" Buttons You can capture still and moving images on the screen. Tapping each button saves, shares or sends a content with one of the file extensions. "Angle", "Hue" Buttons The angle between the color light sources varies every time you tap "Angle". You can also change the marking color in the same way with "Hue". "Index" Button Tapping this button opens an index page. "Flat, Cross, Parallel" Switch (in index pages) This switch enables stereopsis of the polytopes. Choose cross-eyed viewing or parallel viewing, then move your eyes to merge two images.
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