Hyotan shape, with different japanese patterns, flower and bird

Member of the cucurbits family, the Hyotan was introduced to Japan during the early Jomon period and has been part of Japanese life for over ten thousand years. Although sometimes grown for food, it has mainly been cultivated to make vessels or gourds.

http://www.thegourdreserve.com/Jumbo_Hyotan/HyotanIDChart.html

Japanese use different graphical techniques to represent waves symbolically. A seamless pattern of semi circular lines is one of the most common pattern. It can be found on many objects, especially fabrics or paper.