Hayashi Kaku (b.1953) is a Japanese ceramic artist
https://www.internationalceramicsfestival.org/portfolio/kaku_hayashi/

Ceramics and Pottery Arts and Resources

In 1992, Kaku Hayashi was diagnosed with cancer; however, the tumour suddenly disappeared of its own accord. The experience affected her profoundly and she became concerned with the cycle of life and death and began making spherical ring pieces.

Quote from International Ceramics Festival, Aberystwyth, Ceredigion, Wales
https://www.internationalceramicsfestival.org/portfolio/kaku_hayashi/

Tea Bowl Entitled “Hana” / Stoneware with iron-rich glaze / Worcester Art Museum, MA

Wind: Blessing, 2022 / Glazed stoneware / Joan B. Mirviss LTD.

Zero / Glazed stoneware / Private collection

Prayer–Moonlight Ocean, 2022 / Glazed stoneware / Joan B. Mirviss LTD.

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Further reading:
https://japanobjects.com/features/female-ceramic-artists
https://ceramicsmuseum.alfred.edu/exhibitions/teabowl/index.html
https://www.artsandartists.org/wordpress2019/wp-content/uploads/2018/07/prospectus-mingeiceramics.pdf