A cultivated plot, roughly hexagonal in plan, supporting a particular set of more or less genetically engineered food-bearing plant species that, taken together, supply all of the nutritional requirements for a single avout. A web of symbiotic relationships among the species bolsters the health and productivity of the plants while preventing exhaustion of the soil. In concents that employ the tangle system, each avout is responsible for maintenance of one tangle; the produce of all of the tangles is pooled to supply food for the concent. Since a math cannot observe the Discipline when it is dependent on Saecular trade for foodstuffs, the tangle is a fundamental enabling technology for the Reconstitution.