Lean sheets of wood also referred to as wood polish, are crushed and strengthened to form plywood. Because of its quality, solidity, and versatility, plywood is a versatile material that is used in both construction and furniture making. The idea of stacking wood was first recorded in Egypt in about 1500 BC. However, the first standardized plywood sheets were produced in America in 1928. Here is a video showing the production of plywood.