Physics can surprise us when a condition exists that we do not consider. In this video, a child balances log cross-sections on a board that rests on a large curved block. Because the pivot is not a point, but rather a curve, it is possible for the boy to balance unequal weights. The physics has not changed. The round block underneath, in essence, changes the location of the fulcrum. The length of the board to the right of the fulcrum becomes longer (by tilting upward) if he places more weight on the left side of the board. The curved board automatically adjusts the position of the fulcrum to create a balance between the amount of weight per side and the amount of distance to the fulcrum.