The human brain is a pattern-recognition system. Like all animals, we need to be able to detect patterns in our environment. Back in the day, if we hadn’t figured out that when we saw a particular pattern of movement in the bushes, it was a tiger and not a deer, it might have been the end of the story! Our brains are always collecting and comparing sensory inputs to see if we can detect patterns. If a possible pattern turns out to be false, we discard it, even as we add new, proven patterns to our mental libraries.
A healthy heart creates fractal patterns. (Scientists are now using fractal analysis to diagnose heart disease.) Animated fractals are absorbing and calming as we watch them change; a good way to soothe us when we feel stressed.