Why do I hear the sound of marbles bouncing and furniture moving upstairs?

The resonance reflection is the sound of the left and right floors upstairs or the two floors upstairs, which is transmitted through the wall, and your upstairs is empty, and the sound may be transmitted to the inside and reflected many times before entering the wall.

If it is not artificial, it is the principle of heat expansion and cold contraction, and the temperature of the house will rise to a certain extent under the irradiation of the sun during the day, which will make the structure of the joints of the house expand. At night, when the temperature drops, it retracts back to its original state. The movement of the joints of the house rubs against the sound.

This sound is the sound of brittle materials (such as glass, cement and other materials whose compressive capacity is much greater than the shear resistance) and breaking, in other words, it is generally the sound of concrete cracking, but don't worry, the load-bearing part of the floor generally does not crack, mainly the decorative part, such as the screed layer of floor tiles, the ceiling part, due to poor thermal conductivity, different deformation, resulting in cracking (including the top layer). This kind of movement is very large, but it is normal, don't worry, it generally occurs frequently in the spring and autumn seasons with large temperature differences, as for the following possibilities that have not been heard, upstairs wooden floor (ground) slabs, their own high ceilings, foreign decoration industry is more developed, or live in a bungalow! >>>More

That's how it is, when you pick up trash, the characters move.

Passing by to study medicine, I told LZ that it is called blood in the stool... That blue silver he is constipated!!