A small piece of interactive web art. A glass tetrahedron turns over a night sky; the Milky Way flows into it and leaves as a rainbow over a winter coast. Tap the glass and a two-digit number appears inside it, then fades. It means nothing; it's just yours. Real-time three.js glass with Snell's law at each face, a long-exposure-style sky computed per 3 px cell, drag to spin. Free beta, no sign-up, runs on phones.