A barrier is put up so that students can not see each other's work. They take turns placing LEGO bricks and describing it to their partner. When the figure is finished they compare the results. Students also draw their creations from all four sides. Instructions and clarification is always useful.
Students respond quickly to the stimulus and work to teach each other.
Back to back communication is not easy. The temptation to look has to be controlled for sucessful completion of this project.