The tea room is so small that the host and his four guests sit close enough to touch. Its walls are finished in pale clay mixed with chopped straw; a single window, covered in paper, admits a diffuse and even light. There is one hanging scroll, one branch of flowering quince in a bamboo vase and an iron kettle murmuring over charcoal. The host, Haruto Kisaragi, is thirty-one. He opened this room, called Hisashi-an, in a converted rice merchant's storehouse in northern Kyoto two years ago.

Kisaragi belongs to a loose group of young practitioners who are reshaping how tea is served in the city that did most to formalise its rituals. Trained in the classical schools, they have chosen to work outside the traditional structures of lineage and patronage, opening small independent tea rooms that welcome anyone willing to book a seat. Their ceremonies are faithful to the essential gestures, but they are shorter, warmer and conducted with a disarming lack of pomp.

For outsiders, the tea ceremony can seem impossibly codified: every movement prescribed, every utensil freighted with centuries of meaning. Many younger Japanese feel the same intimidation. Kisaragi's aim is to remove it without removing the discipline. He explains each stage of the ceremony quietly as he performs it, encourages questions and serves sweets made by a friend who runs a small bakery nearby. First-time guests are told simply to watch, drink and enjoy the warmth of the bowl in their hands.

Ritual without rigidity

The architecture of these rooms matters enormously. Many of the new tea houses occupy found spaces, such as storehouses, workshops and the upper floors of old townhouses, adapted by local carpenters using salvaged timber and traditional plaster. Materials are humble and deliberately unpolished. At Tsuyu, a tea room run by the practitioner Emi Sakuragawa in a former indigo dyer's workshop, the walls still bear faint blue stains, left intact because, she says, they remind guests that every room has a history before it has a purpose.

The tea ceremony was never meant to be a museum. It was meant to be an afternoon with friends.

Kisaragi is careful not to present his approach as a rebellion. The founders of the tea tradition, he points out, were themselves radicals, stripping away the ostentation of their age in favour of rough bowls, small rooms and an aesthetic of poverty. What he and his peers are doing, in his view, is not rejecting the tradition but returning to its original spirit: attention, humility and the shared experience of a moment that will never be repeated.

Not everyone in Kyoto's tea world approves. Some senior teachers worry that informality risks diluting practices that took generations to refine, and that the popularity of the new rooms among visitors could turn a spiritual discipline into another item on a travel itinerary. The young hosts take these concerns seriously. Most limit bookings, avoid advertising and ask guests to arrive without cameras. Several also continue to study with their own teachers, some of whom visit their rooms quietly to observe.

As the ceremony at Hisashi-an draws to a close, Kisaragi rinses the bowl, wipes it with a folded cloth and sets it down in front of the last guest. The kettle sighs. Outside, a bicycle bell rings in the lane, and somebody laughs. The room absorbs these sounds rather than resisting them. Nobody speaks for a while. When we finally stand, stiff-legged, to leave, it is hard to believe that less than an hour has passed, or that anything so simple could feel so complete.