What is hyogoku?

As an AI language model, I am not sure if you meant "hyogoku" or "hyogu". Here's information on both interpretations:

Hyogoku: There is no clear reference of the word "hyogoku" in both Japanese and English. It could be possible that it is a made-up or misspelled word.

Hyogu: Hyogu (表具) is a traditional Japanese art of making decorative and protective coverings for sliding doors, hanging scrolls, and screens. The term hyogu comprises two words: hyo (表), meaning cover or front, and gu (具), implying tools or implements. In hyogu, thin layers of paper or silk are pasted onto a wooden backing, then decorated with pigments in various techniques such as painting, stamping, or stenciling. Some of the common designs used in hyogu include landscapes, flowers and birds, and Japanese calligraphy. Hyogu has a wide range of uses in Japanese culture and is highly valued as a decorative art form.