then he said, “really?” he reached under the table and pulled out a bucket of gravel. then he dumped some gravel in and shook the jar, causing pieces of gravel to work themselves down into the space between the big rocks. then he asked the group once more, “is the jar full?” by this time the class was on to him. “probably not,” one of them answered. good!” he replied. he reached under the table and brought out a bucket of sand. he started dumping the sand into the jar and it went into all of the spaces left between the rocks and the gravel. once more he asked the 