A Quba rug lies on top of a larger and courser one . True or false ? True , except that the two rugs are one and the same and inseparable . Rassam has combin them in such a way that the illusion is complete . Qubarug , with its rectilinear motifs , has been woven at 60 knots per square centimetre , while the larger rug has only 20 knots to the square centimetre .