It's quite common for graphic designers to borrow ideas, shapes or lines from nature. It's also common for inventors to do the same thing. It's clear that the shape of the humble wing fitted to every plane ever made, was taken from the wing of every bird ever born. The same goes for the inventor of the articulated or 'bendy' bus. He or she must have seen a snake and, rather than running away in fear, decided to notice that long things that bend in the middle can go round corners a lot more easily than rigid things.
Sadly, time has a habit of ruining trends or fashions. Designers and inventors decided to use science and maths to base their ideas on, rather than nature. But when the designers at BMW decided to revive the 6 series, they looked at nature. Or, to put it more accurately, decided to visit the shark tank at their local aquarium. They saw that the shark had a very hydrodynamic shape, and that this would help their new car go fast. But no matter how shapely or hydrodynamic the car is, it isn't going to go fast without power.