One ribbon, tied once, with no start and no end. The knot is Sentiyo's mark: a conversation that comes back round and closes. It pulls tight when the line gets tense and ripples when someone speaks.
The 3D knot is the hero and the app icon. A flat vector knot, the same curve drawn with real over-and-under crossings, covers favicons, print and anywhere 3D can't go. Everything below is live: it mirrors the knot above, so change the colour or pull it and watch.