Last year several advertising companies in New York City realized that they could put Post-it notes on their window and communicate from one building to another and the idea exploded.  I saw a Twitter post about this and was very excited to use this in my classroom. I first tweeted to the Post-it company and begged them for supplies. My current classroom faces a courtyard with over 30 classrooms.  My students and I came up with a saying and a design with a positive message. The Post-it company eventually sent us a really cool briefcase filled with Post-its. I can't wait to get into school and get started...