Fractal tree and fractal snowflakes blow in wind. Tree moves left and right by changing all branching angles. Timing is partly random but wind and angle change follows a sine wave function.
Code repeats branching, each time shrinking length, creating a self-similar pattern known as "fractal." The (Koch) snowflakes are also self-similar fractals. To create swaying effect in wind, used sine function to oscillate angle then redrew branches for every new angle. To do this in a smooth animated way turned out to require some workarounds in Scratch, making code less pretty and concise. Snow blows with same "wind." The swaying in wind idea was from a suggestion from @s_federici on my fractal fern, followed up on also by @papipupepappa Note similarity of fractal branching in lungs, trees, and arterial systems.
