diff --git a/2021/sketch_2021_01_27a/sketch_2021_01_27a.png b/2021/sketch_2021_01_27a/sketch_2021_01_27a.png
new file mode 100644
index 00000000..97534d4d
Binary files /dev/null and b/2021/sketch_2021_01_27a/sketch_2021_01_27a.png differ
diff --git a/2021/sketch_2021_01_27a/sketch_2021_01_27a.pyde b/2021/sketch_2021_01_27a/sketch_2021_01_27a.pyde
new file mode 100644
index 00000000..0dd86159
--- /dev/null
+++ b/2021/sketch_2021_01_27a/sketch_2021_01_27a.pyde
@@ -0,0 +1,23 @@
+from itertools import product, permutations
+
+BORDER = 100
+SIZE = 60
+
+def setup():
+    size(500, 740)
+    background(0)
+    grid = list(product(range(BORDER, width - BORDER + 1, SIZE),
+                        range(BORDER, height - BORDER + 1, SIZE)))    
+    
+    perms = list(permutations((0, 64, 128, 128 + 64, 255), 3))
+    print(len(perms), len(grid))
+    
+    for i, (x, y) in enumerate(grid):
+        if i < len(perms):
+            for j, ca in enumerate(perms[i]):
+                cb = perms[i][(j + 1) % 3]
+                for k in range(10):
+                    t = k / 9.0
+                    cc = lerpColor(ca, cb, t)
+                    fill(cc); noStroke()
+                    circle(x, y, SIZE - k * 2 - j * 20) 
diff --git a/README.md b/README.md
index ecbc51dc..5c82c985 100644
--- a/README.md
+++ b/README.md
@@ -26,6 +26,12 @@ Here are listed some of the tools I have been using:
 
 ---
 
+![sketch_2021_01_27a](2021/sketch_2021_01_27a/sketch_2021_01_27a.png)
+
+[sketch_2021_01_27a](https://github.com/villares/sketch-a-day/tree/master/2021/sketch_2021_01_27a) [[Py.Processing](https://villares.github.io/como-instalar-o-processing-modo-python/index-EN)]
+
+---
+
 ![sketch_2021_01_26a](2021/sketch_2021_01_26a/sketch_2021_01_26a.gif)
 
 [sketch_2021_01_26a](https://github.com/villares/sketch-a-day/tree/master/2021/sketch_2021_01_26a) [[Py.Processing](https://villares.github.io/como-instalar-o-processing-modo-python/index-EN)]