My basic idea of observational Instrument is "Stone".

Stones come from everywhere. Sometimes they come from volcanoes, sometimes they come from the ocean or rivers. By looking at their shape, weight, color, and composition, we can tell which era they came from and how long they have been around.

One of the most common changes in stone is weathering.

When stones are exposed to air and water, they weather, changing their surface color, pattern, and weight.

I am interested in whether the concept of time also plays a role in the act of giving meaning to stones.

The representative example is gemstones.

Gemology is the study of analyzing gemstones.

In wikipedia, the gemologist can tell where the stone came from and how old it is by observing it.

Understanding the pristine structure of a gemstone through spectral analysis will help us determine the origin of the gemstone. This is an important factor in grading gemstones, because, for example, a ruby from Myanmar has a distinctly different internal structure and optical characteristics from a ruby from Thailand. Hardness is also important when dealing with gemstones, and physical hardness is defined by the non-linear Mohs scale.

It is a heavy stone that is placed on top of the lid of a pickle barrel to squeeze out excess water as the final step in making pickles. In other words, an item that takes up a lot of space or is unnecessarily heavy but is not useful is sometimes called a pickle stone.

I think this is an interesting example of how a seemingly innocuous stone can be tied to something meaningful through human action.