A bloom of tiny moon jellyfish in a near-black void, with no water in the picture: 600 by default, up to 2000 on the count prop, each one small and far like a bloom seen from a distance. The glass is colourless; the only colour is in the organs glowing inside. The swarm has read your page: it drifts around the content, keeps clear of it, and softly lights the words nearest to it. Move the pointer and a current runs through the bloom; click and a ring of it crosses the swarm.