The breeding unit of Formulae E-volver consists of special designed software that allows interaction from visitors via a touch screen. The screen displays the
animations of four different formulae simultaneously. The least interesting animation is deleted and makes way for a new animation. A formula that survives multiple
generations, gets a higher fitness score than a formula that is immediately deleted. When composing new formulae the system takes into account the fitness scores:
formulas with high scores are more likely to be elected to the formation of new formulae.