Graph shows every note as a dot, placed by what it's about: notes about similar things sit close together, even if you never linked them. Drag to move around; scroll, pinch (on a phone or tablet) or use the buttons to zoom; click a dot to open the note.
Solid lines are links you made with @; dotted green lines join notes about similar things. Similar at the top turns the dotted lines on or off.
Hover over a note to see what it's connected to. A brand-new note finds its place once Notii has read it, a minute or so after you write.
The dots float gently, each on its own rhythm. They keep still when your device is set to reduce motion.