Here’s another friday fun link. This is a simple yet captivating flash-based particle simulator. Use the radio buttons at the bottom to pick materials and elements to ‘paint’ onto the canvas and watch how they interact – drop some seeds, for example, then some water, watch things grow, try and overwhelm it with an avalanche of sand, or lay down a small fire and pit it against a water fountain. There are tons of cool little interactions and rube goldberg inspired setups you can sketch out with this.