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As the artist Mel Bochner suggested as early as 1970 , in explaining why he does not like the epithet " conceptual " , it is not always entirely clear what " concept " refers to , and it runs the risk of being confused with " intention " .
 Mel Bochner
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
Answer:
 Mel Bochner