Studio Neat has come up with a clever ice mold that forces the ice to freeze from the top down, which forces all the impurities and air in the ice that normally cause cloudiness to be forced to the bottom. When the block is finished freezing, simply pry it from the mold, split it in half with the included tools, and you're presented with a solid, crystal clear cube of ice. You can then split it up more, or pop it in the included "lewis bag" and smash it into perfectly crushed ice.
If you're frequently making cocktails, big clear hunks of ice like this can really put the finishing touches on your elegant concoctions. Studio Neat's Neat Ice Kit looks to be the easiest and most clever way to accomplish that.