More text + clean code a tad

README.md

@@ -9,9 +9,21 @@ This port is running on a 1x1 stick of wood,
 with tissue paper around it.
 
 It doesn't display anything significant.
-It just looks interesting.
+The idea is to have something to look at if you're idle,
+without it being a distraction from more pressing issues.
+If you're familiar with the album "music for airports",
+it's that.
 
-Most people, when they see it,
+Most people, after watching it for a bit,
 form different ideas about what it's displaying.
 That's cool.
 
+
+History
+-------
+
+I was trying to make pixels fade in and out,
+and got the math wrong.
+But what I wound up with looked more interesting
+than what I was trying to make,
+so I kept it.

wallart.py

@@ -36,7 +36,6 @@ class GlitchPixel:
         bmask = (0xff * self.step // 32) & 0xff
         if self.step > self.nsteps/2:
             bmask = 0xff - bmask
-        #bmask = 0xff >> abs(4 - self.step)
         mask = (bmask << 16) | (bmask << 8) | (bmask << 0)
         color = self.color & mask
         grid[self.pos] = color
@@ -47,18 +46,16 @@ class GlitchPixel:
 
 def fade():
     reps = 300 + random.randrange(GRIDLEN)
-    hue = random.randrange(1000)
+    hue = random.randrange(256)
     colors = [fancy.CHSV(hue, 255, v).pack() for v in range(0, 256, 32)]
     rcolors = colors[:]
     rcolors.reverse()
+    colors = colors + rcolors
     for count in range(reps):
         pos = count % GRIDLEN
         for color in colors:
             grid[pos] = color
             pos -= 1
-        for color in rcolors:
-            grid[pos] = color
-            pos -= 1
         grid.show()
 
 def singleCursor():
@@ -88,7 +85,7 @@ def glitchPulse():
         p = GlitchPixel()
         pixels.append(p)
 
-    for f in range(256):
+    for f in range(1000):
         for p in pixels:
             p.frame()
         grid.show()