Imperfections.

The world is marred by imperfections. The blemish on your skin, the dead leaf on the tree. Yet, in all it's imperfections is a system perfected over time. On a macro scale, the little imperfections make nature relatively perfect. If it were not for mutations to DNA, there would be no variation and there would be no selection of the fittest. Every mechanism works in tandem. Gaudi, the Architect of Sagrada Familia, a basilica that has taken more than a lifetime to complete and well, is still pretty much incomplete, knew this well. The cathedral featured sinewy columns and organic shapes. In all the twists, the flow, the cathedral was an architectural marvel. The weight distribution was done so in a very different way from previous Gothic designs. Gaudi understood nature. It is nature to have imperfect shapes. I have spoken much but made little a point. Well, it is pretty simple. Imperfections, you just have to view them in a different light.