You can spend hours cutting out squares of cardboard that represent desks, tables and bookshelves to try out different classroom configurations but it’s hit or miss whether you’ll end up with a good design. DesignU from Smith System can take the guesswork out of furniture layout and make it as easy as point, click and move. The design program is free, works with PCs or Macs and requires Adobe’s Shockwave software. Start with a pre-made blank room or one that already has typical classroom set-ups for you to rearrange and customize. Next, size the room to match yours and add furniture, take some out and move it all around. You can save designs and work on them later. As a classroom activity, how about running a contest where students design their ideal classroom, and then spend some time discussing what the class comes up with.