Graining is the art of imitating the different types of natural wood grain. The hardness of wood varies with the direction of the wood grain. These materials can be molded with or without simulated wood grain details. The French Polish technique is an excellent method to accent exotic wood grain. Perforated leather upholstery and wood grain trim on the Grande was optional. Impressions of the wood grain remain in the concrete 2,000 years later. Certain finishes cause the wood grain to become more pronounced. As rattan has no wood grain, it does not split. Landaus added simulated wood grain trim to go along with the landau top. Throughout the cabin there is leather trim and dark wood grain on the dashboard.