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By contrast , Immanuel Kant , a pioneer of modern idealist thought , held that his version of idealism does “ not concern the existence of things ” , but asserts only that our “ modes of representation ” of them , above all " space " and " time " , are not “ determinations that belong to things in themselves ” but essential features of our own minds .
 Immanuel Kant
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:
 Immanuel Kant