Is it a washbasin used in ancient courts? Does anyone know what this thing is? Please tell me your opinion.

This kind of basin is called vibrating basin.

Ancient toilet utensils were made of metal. Now it's shaped like a washbasin. If the bottom of the basin is decorated with fish patterns, it is called "washing fish"; The bottom of the basin is decorated with two dragon patterns, which are called "washing dragons". This kind of utensil has been widely used in the pre-Qin period, and tong yu washing with water spray appeared in the Tang Dynasty. Its size is like a washbasin, flat bottom, and there is a handle on the left and right sides of the basin, called an ear; There are four carp carved on the bottom of the basin, and four river chart parabolas are carved between fish. The wonderful thing about washing fish is that you rub the ears of the basin quickly and rhythmically, and the basin will vibrate like being hit, and the water in the basin will ripple. Properly rubbed, you can spray water column. When you rub your ears with your hands, there are two sources of vibration. Vibration waves propagate in water and interfere with each other, so that energy is superimposed. So these more energetic water spots will jump out of the water. This is in line with the * * * vibration principle of physics. The production of fish washing undoubtedly involves the propagation and interference of solid vibration in liquid. Some museums in our country treasure this precious ancient fish wash.

The basin bottom is engraved with the year system of Wude in Tang Dynasty, and Wude is the year number of Tang Gaozu, Tang Gaozu. It is obviously impossible for you to do the patina work in this basin so long ago, so it is estimated to be imitation.

However, it is said that 1986 an American institution failed to imitate fish washing. Your basin may be from the Qing Dynasty. Because the fish handed down at that time was washed a lot.

Cherish it, it should be cherished.