A drawn design plan, also called a blueprint, that a workshop weaver follows knot by knot. In the Safavid period, as patterns grew more complex, separate designers, often miniature painters, are said to have drawn them on such plans, so that weavers only carried out others' designs, and weaving schools grew up around this way of working. City rugs from workshops in places such as Tabriz and Isfahan are so precise because they are woven from such plans. Village weavers rely on plans much less, and tribal weavers work from memory and from designs handed down within the family, so their rugs tend to be less symmetrical.