However, depictions of the pear-shaped pipas in China only appeared after the Han Dynasty during the in the late 4th to early 5th century. The pear-shaped pipa may have been introduced during the Han Dynasty and was referred to as Han pipa. Pear-shaped lutes have been depicted in sculptures from the 1st century AD. Relief sculpture from showing a lute being played by a musician (right), 1st-2nd century AD The pear-shaped pipa is likely to have been introduced to China from Central Asia, and/or India. This video may be inappropriate for some users. The burger chain aims to double its store base by 2020, but the national expansion project has some drawbacks.