[2] Inspired by Francis Bacon, Vincent van Gogh, and Itō Jakuchū, most of Katō's sculptures draw from the meaning of life,[3] often resembling embryos or fetuses,[4] and his works are intentionally left untitled to challenge the audience.
[8][4] "Untitled 2004" (無題 2004, Mudai 2004) is a painted wood sculpture, currently owned by the Takahashi Ryutaro Collection,[9][10] that appears to depict a baby-like creature pressed against the wall with its large head turned to the side.
In 2014, Kato responded to the image's derivative use, reluctantly permitting its use by the SCP Foundation as long as he is credited and the work is not used for commercial purposes.
[12] In 2022, the SCP Foundation removed the photograph to avoid possible legal issues as it did not comply with their Creative Commons license, while the entry's original author has requested the work to not be replaced in order to let people envision "SCP-173" for themselves.
[13][14] Kato met a woman named Naoko Kameyama, who was also an aspiring young artist, and they ended up getting married[4] and had children.