Use eight glasses to modulate the scales and you can play music as musical instruments. The method is as follows:

1. Material preparation: 8 water cups of uniform thickness (the number of water cups can be customized according to the scale), water, measuring cylinder or scale, and some chopsticks (for tapping and playing).

2. Analyze design principles.

As shown in the keyboard octave, there are 8 white keys and 5 black keys, totaling 13 tones. The pitch distance between every two adjacent notes is the same. It can be found that there is a black key between the notes 1-2, 2-3, 4-5, 5-6, and 6-7, which means that they are separated by two pitch intervals, while 3-4, 7- _separated by a pitch interval.

The pitch of the water glass depends on the amount of water in the glass. In a water glass, the more water, the lower the sound; the less water, the higher the sound. Combined with the principle of scales, we can find a way to solve the scale of the water cup.

3. Make a water cup scale

If the water volume of a scale is 10 ml, then the distance between 1-2, 2-3, 4-5, 5-6 and 6-7 The distance between water volumes is 20 ml, and the distance between 3-4 and 7-_ is 10 ml. In this way, you can make a basic water cup scale.

By analogy, the water volume at one scale interval can be positioned at 20 ml, 30 ml, etc. (such as the example of water volume in a water cup in the table). The scales in music have fixed intervals, and the water cup can also change the scales with different intervals according to the change of the amount of water, which enriches the space of the scales. Different water cup scales made with different amounts of water can create a rich and colorful musical space.