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Figure 2 At first, two cylinders having equaled level of water and with two clay balls immersed ir the cylinder were shown to the subject. And the question was put up, “Is the level of water equal in both cylinders?” after receiving the response from the subject, the balls were taken out from the cylinders and rolled out into a sausage. Before putting rolled clay ball B into the water cylinder, the subject was asked, “In which cylinder will the level of water be higher?” the response of the subject was noted.