Mandalas and Reiki

Stepping into a Shingon temple in Japan for the first time, you experience something unexpected. To the right and left of the altar hang two enormous scroll paintings — gleaming with gold, densely populated by Buddhas, bodhisattvas and protector deities, threaded through with geometric structures that recall the city plans of a cosmic metropolis. They are the two great mandalas. And the space between them is not empty space. It is the place where the practice begins.

In the Western world, mandalas are mainly known as colourful colouring pages — round patterns for relaxation. That is roughly like describing a cathedral as a nice building with colourful windows. Not wrong. But everything that matters is missing. In Shingon Buddhism, mandalas are ritual diagrams that map the entire universe — and at the same time, the path to awakening.

The two worlds — Ryōbu 両部

At the heart of the Shingon tradition stand two great mandalas, known together as Ryōbu 両部 — the "Two Parts." Each of these mandalas maps one side of reality. Together they form the whole.

The first is the Taizō-kai Mandala 胎蔵界曼荼羅 — the Mandala of the Womb World. It represents the principle of compassion, the unfolded, nourishing side of the universe. Like a womb, it holds all beings, all possibilities, all forms of awakening within itself. At its centre sits Dainichi Nyorai 大日如来, the cosmic Buddha — surrounded by concentric rings of bodhisattvas and protector deities that unfold outward like the petals of a lotus.

The second is the Kongō-kai Mandala 金剛界曼荼羅 — the Mandala of the Diamond World. It embodies the principle of wisdom: indestructible, crystal clear, cutting like a diamond. Where the Taizō-kai flows and nourishes, the Kongō-kai is structured and precise. It consists of nine square fields, each showing its own assembly of Buddhas — and at the centre of each field: again, Dainichi Nyorai.

In the Shingon temple, these two mandalas hang facing each other. The practitioner stands or sits between them — literally between compassion and wisdom. This spatial arrangement is no accident. It is the architecture of an experience: whoever stands between the two worlds stands at the heart of reality itself.

Siddham — the living signs in the mandala 梵字

Looking more closely at the great mandalas, you see more than figures. You see signs. Siddham 悉曇 — the sacred script of esoteric Buddhism — runs through the mandalas like a nervous system. Every Buddha, every bodhisattva, every protector deity has its own Siddham character. It is their sound made visible, their essence as a letter.

Kūkai, founder of the Shingon school in Japan, brought this tradition back from China in the ninth century. There he had received not only the rituals and transmissions, but also the art of Siddham calligraphy. For Kūkai, these signs were no symbols in the modern sense — they were the voices of the Buddhas, frozen in ink. Whoever wrote, recited and meditated on a Siddham touched the force it represented.

In the mandalas, Siddham often stand in place of the Buddha figures. A whole mandala can consist exclusively of Siddham characters — an assembly of cosmic forces shown as written signs on silk. That is no simplification. It is a different layer of representation, particularly powerful in practice because it condenses sound, image and meaning into a single sign.

The body as mandala — Gorin and the Reiki connection 五輪

The mandalas of Shingon Buddhism do not exist only on scrolls. They exist in the body. This is perhaps the most far-reaching insight of this tradition: the human body itself is a mandala — a microcosm carrying the structure of the universe within.

The system that makes this connection is called Gorin 五輪 — the five rings, the five Great Elements. Earth, water, fire, wind and space are mapped onto zones of the body, each with its own Siddham character, colour and quality. From the knees to the soles of the feet belongs to earth. The lower belly to water. The chest to fire. The throat to wind. The crown to space. In meditation the five Siddham are projected onto these zones. The practitioner becomes a living mandala.

And here the bridge to Reiki becomes visible. The Reiki symbols that Mikao Usui integrated into his practice are essentially simplified mandalas. Each symbol is a gateway to a particular quality — power, harmony, distance connection, mastery. In the Western Reiki tradition these symbols are often treated as abstract tools: you draw them, speak their name, and something happens. In Shingon Reiki they are understood in their original context — as condensations of a living tradition shaped by more than a thousand years of practice.

What exactly happens in practice — which Siddham underlie the symbols, how the connection between mandala and energy work is established, which mantras and mudras belong to it — all this is part of the direct transmission. It belongs in the protected space of the live event, not on a website. But the fact that this connection exists is no secret teaching. It is historically documented, recorded in Kūkai's writings, and still alive in the temples of Japan today.

Dainichi Nyorai — the heart of both worlds 大日

At the centre of both mandalas sits the same figure: Dainichi Nyorai 大日如来, the cosmic Buddha, literally "Great Sunlight." In the Taizō-kai Mandala he sits in meditation, hands in the Dhyāna mudra — receiving, holding, nourishing. In the Kongō-kai Mandala he holds the Chiken-in mudra — the index finger of the left hand enclosed by the right fist, wisdom and method joined.

Dainichi Nyorai is not one Buddha among many. He is the principle from which all Buddhas arise. The great mandalas are essentially representations of his infinite qualities — like light passing through a prism and unfolding into countless colours. Every Buddha in the mandala is an aspect of Dainichi. Every Siddham character is his sound at a particular frequency.

For Reiki practice this means: when we work with Reiki energy, we work — from the perspective of the Shingon tradition — with a force whose origin is in Dainichi Nyorai. That is no theological speculation. It is the context in which Usui developed his practice, shaped by the traditions of esoteric Buddhism, Shugendo, Shinto, and shamanic Daoism that were alive in the Japan of the early twentieth century.

Anyone interested in the mandalas of Shingon Buddhism stands at the beginning of a path that reaches far beyond colouring pages and relaxation. The great mandalas are maps of an inner geography that has been explored for over 1200 years. They show that the body is a sacred place, that written signs carry living forces, and that Reiki — rightly understood — is part of a cosmic network that joins compassion and wisdom in every moment.