diff --git a/generators/lines.py b/generators/lines.py
new file mode 100755
index 0000000..7aa2d8e
--- /dev/null
+++ b/generators/lines.py
@@ -0,0 +1,121 @@
+#!/usr/bin/env python3
+
+import sys
+import random
+import math
+import argparse
+import collections
+import blup.frame
+import blup.output
+import blup.animation
+import blup.writebml
+import colorsys
+
+
+WIDTH = 22
+HEIGHT = 16
+DEPTH = 256
+
+
+class Point(collections.namedtuple('Point', ['x', 'y'])):
+    def __add__(self, other):
+        return Point(self.x + other.x, self.y + other.y)
+    def __sub__(self, other):
+        return Point(self.x - other.x, self.y - other.y)
+    def __mul__(self, other):
+        if isinstance(other, Point):
+            raise Exception('not implemented')
+        else:
+            return Point(self.x * other, self.y * other)
+    def __truediv__(self, other):
+        if isinstance(other, Point):
+            raise ValueError()
+        else:
+            return self * (1/other)
+    @property
+    def len(self):
+        return math.sqrt(self.x**2 + self.y**2)
+    @property
+    def n(self):
+        n = Point(self.y, -self.x)
+        return n / n.len
+    @property
+    def intp(self):
+        return Point(int(round(self.x)), int(round(self.y)))
+
+
+def convert_color(c):
+    return list(map(lambda x: int(round(x*(DEPTH-1))), c))
+
+
+def get_random_color():
+    return colorsys.hsv_to_rgb(random.random(), 0.5 + random.random() / 2, 1)
+
+
+class Line:
+    def __init__(self, size):
+        self.size = size
+        r = random.choice([0, 1])
+        s = random.choice([-1, 1])
+        if r == 0:
+            self.pos = Point(size.x if s == -1 else 0,
+                             random.randint(0, size.y - 1))
+        else:
+            self.pos = Point(random.randint(0, size.x - 1),
+                             size.y if s == -1 else 0)
+        self.dir = Point(s if r == 0 else 0, s if r == 1 else 0)
+        m = max(size.x, size.y)
+        self.length = random.randint(int(0.4 * m), int(1.1 * m))
+        self.color = get_random_color()
+        self.speed = 10
+        self.done = False
+
+    def update(self, t, dt):
+        self.pos += self.dir * (dt * self.speed)
+        end = self.pos - self.dir * self.length
+        if self.dir.x > 0 and end.x > self.size.x \
+           or self.dir.y > 0 and end.y > self.size.y \
+           or self.dir.x < 0 and end.x < 0 \
+           or self.dir.y < 0 and end.y < 0:
+            self.done = True
+
+    def draw(self, frame):
+        if self.done:
+            return
+        for i in range(self.length):
+            p = self.pos.intp - self.dir * i
+            try:
+                frame.setPixel(p.x, p.y, convert_color(self.color))
+            except ValueError:
+                pass
+
+
+if __name__ == '__main__':
+    parser = argparse.ArgumentParser(description='Generate animations')
+    parser.add_argument('-d', '--delay', type=int, default=50)
+    parser.add_argument('-t', '--time', type=int, default=15)
+    parser.add_argument('output_file')
+    args = parser.parse_args()
+
+    dim = blup.frame.FrameDimension(WIDTH, HEIGHT, DEPTH, 3)
+    anim = blup.animation.Animation(dim)
+    anim.tags['description'] = ' '.join(sys.argv)
+
+    lines = []
+    t = 0
+    dt = args.delay / 1000
+    while t < args.time or len(lines) > 0:
+        t += dt
+        frame = blup.animation.AnimationFrame(dim, args.delay)
+
+        if len(lines) < 5 and t < args.time:
+            lines.append(Line(Point(WIDTH, HEIGHT)))
+
+        for l in lines:
+            l.update(t, dt)
+            l.draw(frame)
+        lines = list(filter(lambda l: not l.done, lines))
+
+        anim.addFrame(frame)
+
+    blup.writebml.writeBml(anim, args.output_file)