The vertical architecture of the Tree: Mercy on the right, Severity on the left, Mildness down the middle — each a current of light and octave, headed by a supernal sphere. Tap any pillar.
Tap any pillar to see its head-sphere, its three Sephiroth, its function, its hemispheric span, its serpent-channel, and the brightening or darkening colour-octave current it governs — grounded in the Purkinje shift of scotopic vision.
The right pillar (Mercy), headed by white Chokmah, carries the brightening, ascending current; the left pillar (Severity), headed by black Binah, carries the darkening, descending current; the middle pillar (Mildness), headed by the Taiji at Kether, is the axis around which they balance. Blue brightens and red dims as the eye dark-adapts — the physics beneath the metaphor.