Tap to sound. Two fingers = two notes. Hold a key to make it the reference — the figure moves, the drone moves, and everything is measured from that one key. The reference is drawn as the anahata: two interlaced triangles whose crossing is the key and whose six points are the six neighbours.
A key has exactly six neighbours. Look at the highlighted key: it is drawn as the anahata — two interlaced triangles whose crossing IS the key, and whose six points ARE the six directions. Each point's base sits on the key's own edge and its tip lands on the neighbouring key's centre. It is the same figure in every key, because the geometry never changes; only the names do.
Those six directions are only three intervals, each in both directions — a whole tone, a fourth and a fifth:
And the six are half of the twelve. Every note belongs to one of two sets of six; the other set is everything the first one leaves out. Fill in the notes you skipped and the twelve are complete.
Three of the six points lead to keys higher in pitch, three to keys lower. That is a real musical distinction — in a raga it is āroha and avaroha, one of the elements the raga is defined by — so this is the one lesson where the figure's colour is allowed to carry it. Switch it on and look at the figure again.
Written down, because it will change: colour in the figure is a lesson variable, never fixed styling. On its own the figure is one colour. A lesson may mark parts of it independently — the rising three against the falling three; either interlaced triangle as a whole; any single point; the key's body; the name written on it. The button above turns on exactly one such mark. As lessons are written, expect the colours to change and expect more of them.
The whole figure, then: one sound at the centre, six directions out of it, twelve named sounds around, split two ways of six.
Tap a raga below and its seven notes light up on the board — in every octave, wherever they fall.
All 72 are generated by rule in the browser: two madhyamas × six (Ri,Ga) pairs × six (Dha,Ni) pairs. The chakra names are ordinal mnemonics — Bāṇa is the fifth chakra because Manmatha has five arrows, Disi is the tenth because there are ten directions. Nothing here is a pasted table.
Here: a playable board, a drone, three labelling views over one geometry, the anahata
figure at the reference, and 72 scales generated by rule.
Not here yet: notation view, microphone, ornament, rhythm, lessons past the first.
Pitches are computed in cents relative to a reference, so notes between the
twelve are reachable — this page just has no interface for them yet.