diff --git a/2021/sketch_2021_08_20b_shoebot/sketch_2021_08_20b_shoebot.png b/2021/sketch_2021_08_20b_shoebot/sketch_2021_08_20b_shoebot.png
new file mode 100644
index 00000000..4194ddc0
Binary files /dev/null and b/2021/sketch_2021_08_20b_shoebot/sketch_2021_08_20b_shoebot.png differ
diff --git a/2021/sketch_2021_08_20b_shoebot/sketch_2021_08_20b_shoebot.py b/2021/sketch_2021_08_20b_shoebot/sketch_2021_08_20b_shoebot.py
new file mode 100644
index 00000000..70f8a369
--- /dev/null
+++ b/2021/sketch_2021_08_20b_shoebot/sketch_2021_08_20b_shoebot.py
@@ -0,0 +1,66 @@
+# shoebot (code to be run with sbot runner)
+
+from math import radians, sin, cos
+from math import dist as e_dist
+from random import randint
+from functools import cache
+
+def setup_points():
+    global pts_a, pts_b
+    pts_a = create_points()
+    pts_b = create_points()
+
+
+def setup():
+    size(600, 600)
+    strokewidth(1)
+    colorrange(255)
+    var('t', NUMBER, 0.0, 0.0, 100.0)
+    var('d', NUMBER, 150.0, 50.0, 200.0)
+    var("b", BOOLEAN)
+    setup_points()
+
+def create_points():
+    pontos = []
+    for i in range(12):
+        r = randint(-10, 10)
+        m = 20
+        xo = randint(m, WIDTH - m)
+        yo = randint(m, HEIGHT - m)
+        for a in range(-18, 18):
+            x = xo - r  * a * (-1 if r < 0 else 1)
+            y = yo - r * a  + r * 10 * sin(radians(a * 10))
+            pontos.append((int(x), int(y)))
+    return tuple(pontos)
+
+def draw():
+    global frame_count, b
+    background(200)
+    stroke(0)
+    if b:
+        setup_points()
+        b = False
+    pontos = lerp_tuple(pts_a, pts_b, t / 100.0)
+    for xa, ya in pontos:
+        for xb, yb in pontos:
+            not_same = (xa, ya) != (xb, yb)
+            if not_same and d / 3 < dist((xa, ya), (xb, yb)) < d / 2:
+                stroke(0, 0, 128)
+                line(xa, ya, xb, yb)
+            if not_same and d / 4 - 25 < dist((xa, ya), (xb, yb)) < d / 3:
+                stroke(0, 128, 0)
+                line(xa, ya, xb, yb)
+@cache
+def dist(a, b):
+    return e_dist(a, b)
+
+@cache
+def lerp(a, b, t):
+    return a * (1 - t) + b * t
+
+@cache
+def lerp_tuple(a, b, t):
+    return tuple(
+        lerp_tuple(ca, cb, t) if isinstance(ca, tuple) else lerp(ca, cb, t)
+        for ca, cb in zip(a, b)
+    )
diff --git a/README.md b/README.md
index 39fe451f..34a7ebfd 100644
--- a/README.md
+++ b/README.md
@@ -27,6 +27,12 @@ Here are listed some of the tools I have been using:
 
 ---
 
+![sketch_2021_08_20b_shoebot](2021/sketch_2021_08_20b_shoebot/sketch_2021_08_20b_shoebot.png)
+
+[sketch_2021_08_20b_shoebot](https://github.com/villares/sketch-a-day/tree/master/2021/sketch_2021_08_20b_shoebot) [[shoebot](http://shoebot.net/)]
+
+---
+
 ![sketch_2021_08_19b_shoebot](2021/sketch_2021_08_19b_shoebot/sketch_2021_08_19b_shoebot.png)
 
 [sketch_2021_08_19b_shoebot](https://github.com/villares/sketch-a-day/tree/master/2021/sketch_2021_08_19b_shoebot) [[shoebot](http://shoebot.net/)]