For Every Writer's Toolbox: This is Just Too Cool

I've been meaning to write about a really cool game, one I believe belongs in every writer's toolbox for days when you need to coax the muse out to play. The game is called Crayon Physics. The shapes you draw on your screen will move, tumble and roll, depending on how and where you place them. This in turn affects the scene on your screen, and helps you build contraptions reminiscient of Mouse Trap and, ultimately, experiment with physics. Brilliant. There's a free downloadable demo on the website. I dare you to play it without smiling.