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Reconstructing Relations of Distance
Change of Position and the Conservation of Length
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amount angles applies asked base begins bigger bricks build cake change of position child circle composition conservation construction continuous coordinate copy correspondence curves dimensions direction distance draws equal equidistance experimenter fact fail figure finally four further given gives half hand height horizontal IIIB intervals intuitive involved it's later length less level IIIA logical longer look marbles marks measure metrical middle move movement notion objects operational parallel pencil perceptual present problem question reasoning rectangle reference relations remaining responses result ruler says shape shown side similar simply slope space square stage stick straight line sub-stage subdivision subjects successive there's tower transfer triangle true turn understand unit vertical volume whole