The four blocks shown should be arranged so as to get maximum offset from the table's edge. Drag a block to reposition it. Double click to reset all the blocks. The arrowheads indicate the horizontal position of the center of gravity of all the blocks above the arrowheads. That is, the black arrowhead is the horizontal position of the top block, the red arrowhead is the horizontal position of the top two blocks and so on. The extension of a block over the one below it is indicated at the right of the block in units of pixels. The length of the blocks is assumed to be 144 pixels for convenience.