Light (K) is the Pāli term āloka or the general Sanskrit prakāśa—perceived raw clarity that arises as the first of the four elementary Kasiṇa devices. In the classical forty kammaṭṭhāna (meditation subjects) preserved in the Visuddhimagga, the Light Kasiṇa stands as the opening device in the set that uses visible objects as supports for the development of access concentration and full jhāna. Unlike colored kasiṇas, the Light Kasiṇa is cultivated by directing attention to a patch of luminous space—a shaft of sunlight through a gap, a moonbeam, or even the glow of a lamp flame—devoid of any form or figure. Its purpose is to evoke a luminous, unitary perception that blocks out the manifold distinctions of ordinary sight.

Position on the Tree of Life

Binding to Path 30 (the stroke of Resh, the solar intelligence), this subject corresponds to the twentieth step of the Sephir Yetzirah’s thirty-two paths. At this level, the meditation on Light re‑presents the last of the four material-form kasiṇas before the contemplative series shifts toward the gruesome cemetery meditations. Path 30 itself is associated with the Sun in its active, discriminative mode—Pars Fortuna in the microcosm—and the Light device sharpens that solar faculty by reducing all form to undifferentiated radiance.

Historical context

In the Visuddhimagga (Chapter IV, ¶ 28‑30), Buddhaghosa instructs the meditator: “Let him develop the Light Kasiṇa by attending to light that is produced through a hole in a wall or a keyhole, or coming in at a window opening.” The device is deliberately formless: “He should not give attention to the color or the shape of the light; he should attend only to the light as light.” Later commentarial works, such as the Paṭisambhidāmagga, treat the Light Kasiṇa as a doorway to special knowledge, because the sign (nimitta) that arises with it can produce the “knowledge of the divine eye” when cultivated to the fourth jhāna. It is also the first device that the Buddha himself is said to have used after enlightenment, according to the Mahāparinibbāna Sutta (DN 16: “He paid attention to the perception of light,
settled on the perception of day”).

As a category in 777, Light (K) falls under the twenty‑three variable types of the Forty Buddhist Meditations. Its placement at step 30 places it symmetrically across from Earth (K) at step 32 bis and Fire (K) at step 31—the three form‑kasina survivors in a set otherwise nearly consumed by the ten corpse meditations and the Brahmavihāras. In late Theravāda, the Light Kasiṇa is prescribed particularly as an antidote for sloth and torpor: the Visuddhimagga (Chapter V, ¶ 55) lists “the perception of light” among the six methods for arousing the energy factor of enlightenment.

In the table itself, Light (K) is a simple entry: a single word that signals the first of the four uncolored devices. It appears on line 30 of the Forty Meditations column, a stark corrective to the stream of mangled and decaying bodies that precede it (paths 22 through 28), and the only luminous presence before the list concludes with the Earth Kasiṇa, the final stillness of the path.