When asked to find "one CL something" (CL = classifier) among several choices, adults selected solid, shape-matched objects when presented count classifiers, but rejected things that were non-solid or that didn't match in shape.
this distinction was less available to young children, who were willing at age four to accept portions of non-solid stuff when the experimenter requested something with a count classifier, so long as the substance matched the shape specified by the classifier (e.g., toothpaste that was shaped like a rod when the experimenter asked for gen).