Blanket

Lore & Background

An ancient form of blanket is recorded as 'Kambala,' mentioned by the 7th-century Chinese traveler Xuanzang in his travelogue of India (629–645 CE). He described it as a woolen material from sheep or goat hair, used for clothing. In Sanskrit, 'Kambala' means a woolen blanket, and the Atharvaveda uses it as a generic term for shawls and blankets. Known as 'Kambali' in Kannada and Tamil, these thick coarse blankets were woven from sheep wool to provide winter warmth. A type called Pandu-Kambala came from Gandhāra, specifically Uddiyana, noted by the ancient scholar Pāṇini. Other variations include keca-lakah, kalamitika, talicchakam, varavanah, and sarumitika, with coarse qualities used by farmers and herdsmen, and some spread on the backs of animals like horses, elephants, and bullocks.

Reader's Guide

The blanket's significance lies in its fundamental role in human warmth and comfort across cultures and centuries. From ancient Indian kambala to modern synthetic varieties, the blanket has evolved as a practical textile for thermal insulation. Its etymology reflects a blend of linguistic traditions, with the Old French 'blanket' and the eponymous Thomas Blanket theory illustrating how a specific fabric name became generalized. The blanket's uses extend beyond personal warmth: militaries have been major consumers of coarse woolen blankets, baby blankets protect infants, and blankets serve as ground cover for picnics. The term is often interchanged with comforter, quilt, and duvet, indicating its broad conceptual category. The blanket's legacy is one of universal utility, from ancient herdsmen to modern households, and its material diversity—from wool to fleece—demonstrates adaptation to varying needs for warmth, weight, and texture.

Did You Know?

• William Shakespeare is recognized as the first person to use 'blanket' as a verb, in his play 'King Lear' (1608).
• The 7th-century Chinese traveler Xuanzang recorded an ancient blanket form called 'Kambala' during his journey to India.
• A popular theory holds that the word 'blanket' derives from a Flemish weaver named Thomas Blanket (Blanquette) in 14th-century Bristol, England.
• Military blankets tend to be coarse grey with thick fibers over 20 microns.

From Hearth to Heater: A Century-by-Century Evolution

The kotatsu traces its roots to the fourteenth century under the Ashikaga shogunate, when Japanese households depended on charcoal for both cooking and warmth around a floor-level hearth called the irori. A key shift came when a wooden seating platform was added to the irori, separating the act of cooking from the act of sitting. Draping a quilt—called an oki—over this platform trapped the heat of the charcoal below, creating what was known as the hori-gotatsu, or 'dug kotatsu.' In the seventeenth-century Edo period, the floor around the hearth was carved into a square recess, and the wooden frame sat around this pit so a person could tuck their legs beneath the blanket. The portable version emerged with the spread of tatami flooring: coals were placed in an earthen pot set on the mat, making the whole arrangement movable. This was the oki-gotatsu, or 'placed kotatsu.' The final leap came in the mid-twentieth century, when an electric element could be attached directly to the table frame, removing the need for any fuel. By 1997, roughly 81 percent of Japanese homes owned a kotatsu, and the overwhelming majority were electric rather than charcoal-powered.

Construction, Materials, and the Layers of Warmth

Two distinct configurations define the kotatsu in use today. The electric oki-gotatsu pairs a table with a heater mounted on its underside. A thin futon lies beneath the table like a throw rug, a second heavier blanket—called a kotatsu-gake—drapes over the frame and heater, and a tabletop sits on top. The heater warms the enclosed space under the comforter. The charcoal hori-gotatsu, by contrast, is set over a pit cut into the floor, roughly 40 centimeters deep, with a charcoal burner positioned in the pit's floor or walls. In the twenty-first century, the frame itself is no longer restricted to wood; plastic and other materials are common. The blankets carry a long textile history: early kotatsu-gake were woven from bast fibers, and later, between the fourteenth and eighteenth centuries depending on region, they were made from recycled cotton pieced together in the patchwork boroboro style and dyed with indigo. By the 2010s, these coverings had become decorative accessories designed to coordinate with a household's interior décor.

The Heart of Winter Domestic Life

The kotatsu was originally conceived for people wearing traditional Japanese robes, where warm air would enter through the hem and rise to exit around the neck, heating the whole body. Today, a person sits on the floor or on zabuton cushions with legs tucked under the table, the blanket draped over the lower body. During winter evenings, the kotatsu becomes the gravitational center of the home: family members cluster around it for meals, television, board games, and conversation while their legs stay toasty. There is a well-known sentiment that once you slip underneath, everyday worries dissolve into a familiar, enveloping warmth. Napping under the kotatsu is common, though overnight sleeping is discouraged—the low table means the body is never fully covered, heating is uneven, and a sleeper might accidentally brush against heating elements. Children are traditionally warned they will catch a cold. Cats, however, are perfectly sized to curl up completely beneath the blanket, much as Western cats seek out floor heating vents. In summer, the blanket is simply removed and the kotatsu reverts to an ordinary low table.

Economics, Insulation, and Global Cousins

Japanese residential construction generally lacks the thick insulation and central heating systems standard in Western homes, making winter heating both costly and drafty. The kotatsu addresses this gap with remarkable efficiency: the layered futons trap warm air in a small, localized space, so a family can concentrate its evening activity in one corner of the house and keep energy bills manageable. This economical, sociable approach to staying warm while seated is not unique to Japan. In Spain and Portugal, the mesa camilla—a small round table with a brasero brazier tucked underneath—serves a nearly identical purpose. Iran's korsi and similar historical heating tables in the Netherlands fill the same niche of affordable, communal, spot-heating. What unites all these devices is the principle of enclosing a modest heat source beneath a draped covering so that a small group can share warmth at minimal cost, turning a practical solution into a social gathering point.

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