The Kickstarter ended in 2011, and their web site at http://www.pluspool.org/ http://www.pluspool.org/ has options to buy tiles. It looks like they've pursued

The Kickstarter ended in 2011, and their web site at http://www.pluspool.org/ http://www.pluspool.org/ has options to buy tiles. It looks like they've pursued other fundraising options after Kickstarter.