That thing on the chatper pages of Jurassic Park

Drawing1.java

public class Drawing1 {
    
    public static void main(String[] args) {
        Turtle.setSpeed(1000);
        y(10);
    }
    
    static void x(int n) {
        if (n == 0) {
            return;
        }
        else {
            x(n-1);
            Turtle.turn(90);
            y(n-1);
            Turtle.draw(10);
        }
    }
    
    static void y(int n) {
        if (n == 0) {
            return;
        }
        else {
            Turtle.draw(10);
            x(n-1);
            Turtle.turn(-90);
            y(n-1);
        }
    }
}