Click flag to see frost form slowly on window edges. . Don't use turbo unless you want to skip the growth and jump to the final pattern. Wintery fractals include window frost (from l-system code), "Koch Snowflake," and bare tree.
Compare to my DLA window frost: https://scratch.mit.edu/projects/939646959/ I heard the phrase "frozen fractals" in "Let it Go" from the movie "Frozen." The "frost" here grows by a system of commands, know as L-system, turning left, right, and move forward. In this case of this window frost, the turn is 90 degrees. The L-system convenient for building a wide variety of fractals. Fractals are self-similar patterns, having a shapes that appears at large and small scales. Zoom in and you see similar patterns, but smaller. Look inside to see that the code uses L-System terms: "F" indicates move foward by the step length, the term "+" means turn clockwise, "-" counterclockwise by the turn angle. In case we want to add slowly branching fractal trees later, I left in the code interpreters for branching although we don't use that here (that branch point code includes "[" to indicate branching point, and "]" means branch completed). Here I used in the background a static fractal tree from my earlier winter fractals project. I saw the frost pattern here, under "icy fractal": onlinemathtools dot com/l-system-generator I added a midi version dance of the sugar plum fairy by Tchaikovsky, which I had edited to play faster than it should be, and cut off early, to limit size.
