How Magic Tricks Work and the Fuzzy Amodal Completion

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1 What shapes, when partly covered, are expected to generate relatively “fuzzy” amodal completion? Can you think of a method that an experimenter could use to measure the fuzziness/precision of an observer’s amodal percepts?
Amodal perception is essential in creating powerful magic through cognitively impenetrable perceptual mechanisms. When specific shapes are partially covered, they produce a relatively fuzzy amodal completion, and these are the triangle, square, and circle shapes (Ekroll et al., 2017).
An experimenter may be able to measure the fuzziness or precision of an observer’s amodal percepts using a method that employs multiple observers. The experiment needs five to ten observers. Then, the experimenter must prepare real-world objects that stimulate the observers’ amodal perceptions. The experimenter may also carry out two sets of experiments. In the first experiment, the observers may look at the objects simultaneously. However, the observers may examine the objects individually for the next experiment. Through the experiments, the...