Mystery Theme IV: Back To School by KlionskyG

Question 6

The three works of art included in the montage linked below share what word in their titles (redacted in yellow)? Clockwise from bottom left, they are:

(1) from the Joseon Dynasty (craftsman and year unknown), in the National Palace Museum of Korea, Seoul

(2) by Margarite Deneva (1975), in the Varna City Art Gallery, Bulgaria

(3) by Yun Soo Kim (2003), at the Korean Art Museum Association, Seoul

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Calmness (LMN)