Blockee is a web app that lets you visualize improvements to your block. It came about during Labs Fridays* while I was a 2012 fellow with Code for America. Blockee was built in collaboration with Jesse Bounds, Nick Doiron and Serena Wales. Try it out at blockee.org. *Lab Fridays is based on google’s 20% time. It’s time CfA fellows are given to experiment with emerging technology and any ideas we’re excited about whether they are or aren’t practical.