Puzzle

A children’s puzzle, comprising:

• a rigid frame having two opposite broad sides defining a thickness therebetween;
• and
• a set of removable, rigid, non-interlocking pieces each having a flat bottom surface, at least three of the pieces having different perimeter shapes;
• wherein each broad side of the rigid frame defines multiple recesses therein, each recess surrounded by one or more elevated surfaces of the rigid frame, at least one of the recesses on at least one broad side of the rigid frame configured to loosely contain multiple pieces of the set;
• wherein the recesses of each of the broad sides of the rigid frame are sized to simultaneously accommodate all of the pieces of the set;
• wherein the recesses of the two opposite broad sides of the rigid frame are arranged differently, so as to form respective arrangements of the pieces of the set when accommodated in the recesses;
• and
• wherein the pieces of the set and the recesses of each of the two opposite broad sides of the rigid frame are configured such that the pieces, as accommodated, are retained in the recesses only by gravity.