3d-pattern. Containing: 3 hexagons. Each hexagon has one triangle-hole; The missing triangle is glue-ed on top. (and rotated 3 triangles. (Rotating 2 triangles is more interesting tho, but the image above doenst show that version.) There are several ways you can connect the layers in eachother: Creating multiple optional patterns,... Aah-well... just to let you know..