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This website provides challenges where students have to replicate specific 2D images on a 3D platform. For the spatially challenged, such as myself, this is not as simple of a task as it first seems! I particularly love this site because it easily lends itself to small-group collaboration, trial and error discussions and problem solving -- all skills for our 21st century learners. Put it on the SMART Board, and work through together as a class, or make the SMART Board a 'center' with this one Geometry activity for one group of 3-5 students to tackle, while other small groups work on additional geometry challenges around the room (traditional pen and paper Math problems, building 3D models, etc.)

Down-and-dirty Guidelines for Effective Discussions in Online Courses