Lots of turtles stepping through Perlin Noise fields. Each step the turtle moves forward an amount based on its position in one Perlin Noise field and rotates it's heading based on its position in another Perlin Noise field. This creates a whimsical effect in the flow of each turtle.
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// You can find the Turtle API reference here: https://turtletoy.net/syntaxCanvas.setpenopacity(1);