“…Recognition task performance showed that some children had real conceptual difficulties, which conforms to claims by Piaget andInhelder (1948/1956) about this task. Several authors have remarked that the water-level task is difficult for children (Beilin, Kagan, & Rabinowitz, 1966;Ford, 1970;Robertson & Youniss, 1969, Shantz & Smock, 1966 and even for some adult college students (Howard, 1978;Rebelsky, 1964;Thomas & Jamison, 1975;Thomas, Jamison, & Hummel, 1973;Willemsen & Reynolds, 1973). Beard (1964) discussed the lack of synchrony between children's performance on the water-level task and the standard vertical task, and concluded that the vertical is understood at an earlier age than the horizontal.…”