31st January 2022 Sunny I went to my university library today. I read a book about the history of the words "persona", from ancient Greece to Kant. The theme looked difficult, but it was easy to read. The word "persona" is used in Japanese as "ペルソナ(perusona)", as a foreign word, and it is rarely translated. There are few people on the campus because we are on spring vacation, but I met my friend. He said that staying home makes him sleepy, so he came here. I should imitate his behavior. I probably won't go to the university during spring vacation after tomorrow because my commutation pass has expired. I will go to a near library and cafes not to only sleep at home.