How do you know when to count one bump on the back of the rug as one knot? It’s easy… Look carefully at the individual areas of color across the width of the back of the rug. If you only see colored elements in pairs, you need to count each pair as one knot. If you see lots of single colored elements, the rug has offset warps and each element should be counted as one knot. Many authentic rugs from Turkey, Afghanistan and Iran show both knot elements on the back of the rug, as do Bokharas from Pakistan. Most rugs from India and China have strongly offset warps, and show only one knot element on the back of the rug.