In order to make ice cubes one needs water, a mold and low temperature. Not all ice cubes are made alike though and these people have gone a step further with their ice cube creations.
People working on a project called 3D on the Rocks used CNC (computer numerical control) and a milling maching to make incredible ice cubes. In order to prevent the ice from melting it was necessary to keep the blade at a temperate no higher than -7 C (about 19 F). It took between 1 and 6 hours to create each ice cube