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In the model developed by Denise Schmandt-Besserat , the tokens were first reported on the clay envelopes , then on clay tablets and this led to the creation of the first written signs , which were pictograms , drawings which represent a physical object ( logograms , one sign = one word ) .
 Denise Schmandt-Besserat
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:
 Denise Schmandt-Besserat