The faithfully handcrafted ball of ice by your bartender in Japan bears testament to the country's dedication to their craft. A perfectly round ball of ice is carved by the bartender from a block of ice in 10 seconds flat. A technique that takes an apprentice years to master. All this effort so you get to enjoy your cooled drink longer as the ice ball melts slower than ordinary ice cubes!
For professional pubs that want the same quality of ice but, lacking in experience, a professional copper machine is available for around $1,000. For the discerning home drinker, plastic moulds are available at MOMA, Muji or Daiso. I know where I am getting mine =)