diff --git a/2020/sketch_2020_05_23a/sketch_2020_05_23a.gif b/2020/sketch_2020_05_23a/sketch_2020_05_23a.gif
new file mode 100644
index 00000000..4aa14a1e
Binary files /dev/null and b/2020/sketch_2020_05_23a/sketch_2020_05_23a.gif differ
diff --git a/2020/sketch_2020_05_23a/sketch_2020_05_23a.pyde b/2020/sketch_2020_05_23a/sketch_2020_05_23a.pyde
new file mode 100644
index 00000000..3f5047c0
--- /dev/null
+++ b/2020/sketch_2020_05_23a/sketch_2020_05_23a.pyde
@@ -0,0 +1,26 @@
+from __future__ import division
+
+def setup():
+    size(400, 400) 
+    rectMode(CENTER)
+    strokeWeight(3)
+    noStroke()
+    
+def draw():
+    background(240)
+    xa, ya = 100, 100
+    xb, yb = 300, 300
+    ca = color(200, 0, 0, 100)
+    cb = color(0, 0, 200, 100)
+    sa = map(mouseY, 0, height, 10, 200)
+    sb = 210 - sa
+    n = 1+ int(mouseX / 10)
+    for t in range(n + 1):
+        xc = lerp(xa, xb, t / n)
+        yc = lerp(ya, yb, t / n)
+        cc = lerpColor(ca, cb, t / n)
+        sc = lerp(sa, sb, t / n)
+        fill(cc)    
+        rect(xc, yc, sc, sc)
+        
+    
diff --git a/README.md b/README.md
index 7e14c53c..2e38e652 100644
--- a/README.md
+++ b/README.md
@@ -16,6 +16,13 @@ You may also support my artistic work, open educational resources and research u
 
 ## 2020
 
+---
+
+![sketch_2020_05_23a](2020/sketch_2020_05_23a/sketch_2020_05_23a.gif)
+
+[sketch_2020_05_23a](https://github.com/villares/sketch-a-day/tree/master/2020/sketch_2020_05_23a) [[Py.Processing](https://villares.github.io/como-instalar-o-processing-modo-python/index-EN)]
+
+`map()`, `lerp()` and `lerpColor()` example
 
 ---