The Blade Pyramid Illusion Plans by Jc Sum

The Blade Pyramid was created by JC Sum and released in 2011. The prop is a pyramid-shaped box with a lady's silhouette on the front. The side door on the prop is opened and the assistant enters the prop. Four solid metal blades (that can be examined) are placed vertically into the front of the prop at even intervals. Next, three swords or spears are inserted into three corners of the front of the pyramid prop. The prop is turned completely around so the audience can see the blades & swords extend fully through the prop. The blades & swords are removed, the door opened and the girl emerges unharmed.