An Almost-Cube Made of 16 Smaller Metallic Cubes

An almost-cube made of 16 smaller metallic cubes. These cubes display a omnidirectional magnetic-like attraction to each other. When pulled more than a foot apart they do not attract with any discernable force, but the closer they come the harder it is to pull them apart. When an organic object is placed between two attracting cubes it begins to warm steadily. The cubes cannot be melted, but the hotter they get the stronger the attractive force. They do not attract to regular metals, but may weakly interact with some metallic weird items.