Abstract: A resilient mold including a plurality of cavities in which a plurality of concrete blocks are cast. Cured concrete blocks are demolded from the mold by supporting the inverted mold on a support surface, engaging two opposing edges of the mold and separating the mold from the support surface so that the mold bends or sags to release the blocks from the mold cavities. The mold includes at least one wall extending in a direction between the two opposing edges between two adjacent mold cavities. One or more resilient support rods is embedded in the wall. The support rods are shaped to bend in a first direction while resisting bending in a direction perpendicular to the first direction. The rods are oriented in the wall for preventing the wall from deforming as the adjacent mold cavities are filled with concrete, while permitting the wall to bend during demolding.