diff --git a/2019/sketch_190823c/sketch_190823c.gif b/2019/sketch_190823c/sketch_190823c.gif
new file mode 100644
index 00000000..34bbc471
Binary files /dev/null and b/2019/sketch_190823c/sketch_190823c.gif differ
diff --git a/2019/sketch_190823c/sketch_190823c.pyde b/2019/sketch_190823c/sketch_190823c.pyde
new file mode 100644
index 00000000..07784584
--- /dev/null
+++ b/2019/sketch_190823c/sketch_190823c.pyde
@@ -0,0 +1,83 @@
+# import copy as cp
+
+add_library('pdf')
+polys = []
+current_poly = []
+divisoes = 5
+salvar_pdf = False
+ponto_clique = []
+
+def setup():
+    size(700, 700)
+    strokeJoin(ROUND)
+
+def draw():
+    if salvar_pdf:
+        beginRecord(PDF, "####.pdf")
+
+    mh, mv = width / 2, height / 2
+    translate(mh, mv)
+    background(240, 240, 200) 
+    
+    angulo = radians(360. / divisoes)
+    fill(0, 0, 200)
+    noStroke()
+    for num in range(divisoes):
+        rotate(angulo)
+        for poly in polys:
+            # (x1, y1), (x2, y2) = poly
+            print poly
+            draw_poly(poly)
+            scale(-1, 1)
+            draw_poly(poly)
+            scale(-1, 1)
+
+    if salvar_pdf:
+        endRecord()
+        global salvar_pdf
+        salvar_pdf = False
+
+    if current_poly:
+        noFill()
+        stroke(0)
+        for num in range(divisoes):
+            rotate(angulo)
+            draw_poly(current_poly + [(mouseX, mouseY)])
+            scale(-1, 1)
+            draw_poly(current_poly + [(mouseX, mouseY)])
+            scale(-1, 1)
+
+def draw_poly(poly):
+    pushMatrix()
+    translate(-width / 2, -height / 2)
+    beginShape()
+    for p in poly:
+        vertex(p[0], p[1])
+    endShape(CLOSE)
+    popMatrix()
+
+def mousePressed():  # def mouseDragged():
+    if mouseButton == LEFT:
+        current_poly.append((mouseX, mouseY))    
+    if mouseButton == RIGHT:
+        polys.append(current_poly + [(mouseX, mouseY)])
+        current_poly[:] = []
+
+def keyPressed():
+    global salvar_pdf, divisoes
+    if key == "a":
+        polys[:] = [[]]  # esvazia lista de polys
+        ponto_clique[:] = []
+    if key == "g":
+        saveFrame("#####.png")
+        print("salvando PNG")
+    if key == "p":
+        salvar_pdf = True
+        print("salvando PDF")
+    if key == BACKSPACE and polys:
+        polys.pop()
+    if key == "-" and divisoes > 2:
+        divisoes -= 1
+    if key == "+" or key == "=":
+        divisoes += 1        
+        
diff --git a/README.md b/README.md
index 8edbea39..d755bc46 100644
--- a/README.md
+++ b/README.md
@@ -18,6 +18,33 @@ You may also support my artistic work, open teaching resources and research with
 
 ## 2019
 
+---
+
+![sketch_1900823a](2019/sketch_190823c/sketch_190823c.gif)
+
+[sketch_190823c](https://github.com/villares/sketch-a-day/tree/master/2019/sketch_190823c) [[Py.Processing](https://villares.github.io/como-instalar-o-processing-modo-python/index-EN)]
+
+Interactive symmetryc polygons
+
+---
+
+![sketch_1900822c](2019/sketch_190822c/sketch_190822c.gif)
+
+[sketch_190822c](https://github.com/villares/sketch-a-day/tree/master/2019/sketch_190822c) [[Py.Processing](https://villares.github.io/como-instalar-o-processing-modo-python/index-EN)]
+
+Interactive symmetric lines
+
+---
+
+![sketch_1900821c](2019/sketch_190821c/sketch_190821c.png)
+
+[sketch_190821c](https://github.com/villares/sketch-a-day/tree/master/2019/sketch_190821c) [[Py.Processing](https://villares.github.io/como-instalar-o-processing-modo-python/index-EN)]
+
+---
+
+![sketch_1900820a](2019/sketch_190820a/sketch_190820a.gif)
+
+[sketch_190820a](https://github.com/villares/sketch-a-day/tree/master/2019/sketch_190820a) [[Py.Processing](https://villares.github.io/como-instalar-o-processing-modo-python/index-EN)]
 
 ---