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diff --git a/2020/sketch_2020_03_24a/sketch_2020_03_24a.pyde b/2020/sketch_2020_03_24a/sketch_2020_03_24a.pyde
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+# L-System - Hilbert Curve
+
+iterations = 7
+stroke_len = 600
+angle_deg = 90
+axiom = "L"
+sentence = axiom
+rules = {
+    'L': '+RF-LFL-FR+',
+    'R': '-LF+RFR+FL-',
+}
+
+def setup():
+    size(700, 700)
+    global xo, yo
+    xo, yo = 50, height - 50
+    strokeWeight(1)
+    noFill()
+    generate(iterations)
+
+def draw():
+    background(0)
+    translate(xo, yo)
+    plot(radians(angle_deg))
+
+def generate(n):
+    global stroke_len, sentence
+    for _ in range(n):
+        stroke_len *= 0.5
+        next_sentence = ""
+        for c in sentence:
+            next_sentence += rules.get(c, c)
+        sentence = next_sentence
+
+def plot(angle):
+    for c in sentence:
+        if c == "F":
+            stroke(255)
+            line(0, 0, 0, -stroke_len)
+            translate(0, -stroke_len)
+            # ellipse(0, 0, 10, 10)
+        elif c == "+":
+            rotate(angle)
+        elif c == "-":
+            rotate(-angle)
+        elif c == "[":
+            pushMatrix()
+        elif c == "]":
+            popMatrix()
+
+def keyPressed():
+    global angle_deg, xo, yo, stroke_len
+    if key == '-':
+        angle_deg -= 1
+        print(angle_deg)
+    if str(key) in "=+":
+        angle_deg += 1
+        print(angle_deg)
+    if key == 's':
+        saveFrame("####.png")
+    if key == 'a':
+        stroke_len *= 2
+    if key == 'z':
+        stroke_len /= 2
+    if keyCode == LEFT:
+        xo -= 25
+    if keyCode == RIGHT:
+        xo += 25
+    if keyCode == UP:
+        yo -= 25
+    if keyCode == DOWN:
+        yo += 25