A mold defines a first volume for an ice cube, the mold comprising a bottom face having an inner perimeter and side faces. Each side face has an inner perimeter, top edge, and bottom edge. The top edge of each side face may be longer than the bottom edge. Each side face may extend inward from the top edge to the bottom edge. The mold may comprise a three-dimensional shape within the first volume, the three-dimensional shape comprising a second volume. The second volume may be defined by a top outer perimeter, a bottom outer perimeter, and at least a bulge of the three-dimensional shape. The bulge may extend upwardly and taper between the bottom outer perimeter and the top outer perimeter. The mold may further define a third volume between the first and second volumes, with the mold configured to receive water within the third volume.