Here's an explanation of the springs, which are part of what they call force vectoring. This is from
drivetribe.com
Spring Is Here - Well Vectoring Springs Anyway
Another new feature - there's quite a lot of them isn't there? - for the third generation Fiesta ST are vectoring springs. Say what now? Let me explain - without going in to full-blown James May mode. These Ford-patented force vectoring springs are used on the ST's twist-beam rear suspension, and are able to apply vectoring forces to the rear suspension as well as enabling cornering forces to travel directly into the spring, for increased lateral stiffness.
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The all-new Fiesta ST is the first compact hot-hatchback to benefit from the technology that uses non-uniform, non-interchangeable, directionally-wound springs, and these are cold-formed for better strength and durability. The benefits of using such as system is that the Fiesta ST will offer a sharper turn-in as well sharper steering responses, plus it offers 10 saving other a traditional set up. Ford also states that this setup will not compromise comfort or ride quality, so it sounds like a win-win in my book.
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“We went through three times the normal number of suspension iterations to find a set-up that delivered the exciting driving experience demanded of an ST model, but also comfort and refinement for everyday driving,” Roeks said. “The car’s sophisticated dampers self-adjust to tune out high-frequency road imperfections when there is limited demand for damping – like on the motorway, but adjust again to deliver optimised road-holding performance when driven hard.”
Here's another pic one of the blue, in case you don't like the red