Before revision:  Virtual and real object occlusions are implemented to enable a natural appearance of virtual bricksinside real bricks . LEGO players' hand detection and occlusion are realized to allow a realistic immersive AR experience, in which virtual bricks can be "grasped" by the real hand, facilitating hand-eye coordination in AR.
After revision:  Virtual and real object occlusions are implemented to enable a natural appearance of virtual bricksinside real bricks . LEGO players' hand detection and occlusion are realized to visualize the correct spatial relationship between real hands and virtual bricks, and allow virtual bricks to be "grasped" by the real hand, facilitating hand-eye coordination in AR.