During our tour in Chengdu, China, we were taking to a place that was famous for embroidery. There were large machines doing the work as well as people doing smaller works. Both types of embroidery were very intricate and complicated. One of the staff workers at the embrodiery business mentioned that a worker can only do this type of work for 20 years before their eyes are effected and they can no longer see the tiny threads. There were some gorgeous silk embroidered pieces and some flawlessly had same picture on both sides! A few displayed a different picture on both sides. Yet, no knots and flaws were to be seen. Absolute perfection is my only description for this ancient silk art!