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diff --git a/2019/sketch_191020a/sketch_191020a.pyde b/2019/sketch_191020a/sketch_191020a.pyde
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--- /dev/null
+++ b/2019/sketch_191020a/sketch_191020a.pyde
@@ -0,0 +1,58 @@
+from random import choice
+
+def setup():
+    size(600, 600)
+    noLoop()
+    rectMode(CENTER)
+    strokeJoin(ROUND)
+    blendMode(MULTIPLY)
+
+def draw():
+    background(255)
+    grid(width / 2, width / 2, 4, width)
+
+def grid(xo, yo, n, tw, e=None):
+    """
+    Faça o desenho do grid baseado em uma subdivisão (grade) recursiva
+    """
+    cw = tw / n
+    offset = (cw - tw) / 2.
+    for i in range(n):
+        x = xo + offset + cw * i
+        for j in range(n):
+            y = yo + offset + cw * j
+            if cw > 30 and random(10) < 8: # faz subdivisão recursiva
+                grid(x, y, 3, cw) 
+            else:  # faz um elemento "sozinho"
+                poly_arrow(x, y, cw, i, j)
+
+
+
+def poly_arrow(x, y, s, i, j):
+    w = s / (1 + i) # x / s)
+    h = s / (1 + j ) # y / s)
+    noStroke()
+    fill(64 + i * 64, 64 + j * 64, 200)
+    """ Seta na posição x, y com largura w e altura h"""
+    mw = w 
+    mh = h 
+    pushMatrix()  # preserva o sistema de coordenadas atual
+    translate(x, y)  # translada a origem do sistema de coordenadas
+    r = choice((0, 1, 2, 4))
+    rotate(r * HALF_PI)
+    beginShape()  # começa a desenhar a forma, inicia um polígono
+    vertex(0, -0 - mw)
+    vertex(-mw  , 0)
+    vertex(-mw, mh)
+    vertex(0, mh - mw)
+    vertex(mw, mh)
+    vertex(mw, 0)
+    # vertex(0, 0)
+    endShape(CLOSE)  # encerra a forma a fechando no primeiro vértice
+    popMatrix() # retorna o sistema de coordenadas anterior
+    
+
+def keyPressed():
+    if key == 's':
+        saveFrame("####.png")
+    redraw()