ABSTRACT
Method: I. The experimenter begins by putting on the table a long cardboard rectangle. One of its edges is colored from left to right with bands of blue, red, and black. The experimenter asks the child to draw them, then asks for a predictive drawing showing the same colors after the rectangle is pivoted 1800 • The experimenter turns the cardboard and compares the result with the drawing,
I * The French text gives the number as five, but this contradicts Figure 6 and the "Method" section.
