Skeleton is pricked to paper, it includes stuff, connecting device, the stuff be connected each other after inserting connecting device, connecting device in be equipped with the slot, the stuff fix in inserting the slot, for satisfying different connected modes, connecting device including the linear type spread groove of two stuffs of lug connection, make two stuffs form right angle type spread groove that right angles are connected, make three stuffs connect for the T type spread groove of T type, make cross spread groove that four stuffs connect, make three stuffs connect for three -dimensional orthogonal three -dimensional right angle type three -terminal spread groove, make six roots of sensation stuff connect and hold spread grooves for three -dimensional orthogonal three -dimensional right angle type six. Connecting device has been adopted, very convenient connecting of stuff to can constitute various shapes wantonly, improve the efficiency of installation greatly, connecting device's slot makes the connection between the stuff more firm, difficult not hard up falling apart.