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diff --git a/2019/sketch_190813a/grid.py b/2019/sketch_190813a/grid.py
new file mode 100644
index 00000000..a8c1e9e7
--- /dev/null
+++ b/2019/sketch_190813a/grid.py
@@ -0,0 +1,75 @@
+from random import choice
+
+class Grid():
+
+    def __init__(self, pos, **args):
+        self.pos = PVector(*pos)
+        self.vel = PVector(choice((-1, 1, .5, -.5)), choice((.25, -.25)))
+        self.shapes = Grid.create_shapes((0, 0), **args)
+        self.space = args['space']
+
+    def update(self):
+        for sh in self.shapes:
+            Grid.draw_element(sh, self.pos.x, self.pos.y)
+        if dist(mouseX - width / 2, mouseY - width / 2,
+                self.pos.x, self.pos.y) < self.space * 5:
+            self.pos += self.vel * self.space
+        if self.pos.mag() > width / 2: # * height:
+            self.vel = self.vel * -1
+
+    @staticmethod
+    def create_shapes(pos, dims, space, elem):
+        gx, gy = pos
+        col_num, row_num = dims
+        result = []
+        half_w = col_num * space / 2.
+        half_h = row_num * space / 2.
+        for ix in range(col_num):
+            x = gx + ix * space + space / 2. - half_w
+            for iy in range(row_num):
+                y = gy + iy * space + space / 2. - half_h
+                noFill()
+                result.append(Grid.create_element(x, y, ix, iy, *elem))
+        return result
+
+    @staticmethod
+    def create_element(x, y, ix, iy, *args):
+        sh = args[0]  # shape
+        si = args[1]  # size
+        c = color(128)
+        # print ix, iy
+        if int(si) % 3 == 0:
+            si *= 0.25 + 0.25 * ((ix + iy) % 3)
+        elif int(si) % 2 == 0:
+            c = color(0, 0, 200)
+            si *= 0.5 + 0.5 * ((ix + iy) % 2)
+        
+        if (ix + iy) % 3 ==0:
+            c = color(200, 0, 0)
+        elif (ix + iy) % 2 == 0:
+            c = color(0, 0, 200)
+
+            
+
+        if args[0] in (RECT, ELLIPSE):
+            return (sh, x, y, si, si, c)
+            print sh
+        elif sh == TRIANGLE:
+            return (TRIANGLE, x, y, x + si, y, x, y + si, c)
+        elif sh == TRIANGLES:
+            return (TRIANGLE, x, y, x - si, y, x, y - si, c)
+        
+    @staticmethod    
+    def draw_element(el, sx, sy):
+        fill(el[-1])
+        sh, ex, ey = el[0], el[1], el[2]
+        pushMatrix()
+        translate(sx, sy)
+        if sh == RECT:
+            rect(ex, ey, el[3], el[4]) 
+        if sh == ELLIPSE:
+            ellipse(ex, ey, el[3], el[4]) 
+            print "e"
+        if sh == TRIANGLE:
+            triangle(ex, ey, el[3], el[4], el[5], el[6]) 
+        popMatrix()
diff --git a/2019/sketch_190813a/sketch_190813a.pyde b/2019/sketch_190813a/sketch_190813a.pyde
new file mode 100644
index 00000000..f6931602
--- /dev/null
+++ b/2019/sketch_190813a/sketch_190813a.pyde
@@ -0,0 +1,49 @@
+"""Grid study"""
+
+from random import choice
+
+# add_library('GifAnimation')
+# from gif_exporter import gif_export
+
+from grid import Grid
+
+def setup():
+    size(500, 500)
+    rectMode(CENTER)
+    strokeJoin(ROUND)
+    strokeWeight(1.5)
+    create_grids()
+    frameRate(5)
+    noStroke()
+
+def create_grids():
+    global grids
+    grids = []    
+    for i in range(20):
+        d = int(random(3, 11))  # TODO: rectangular grids
+        sp = 20
+        x = int(random(-7, 8)) * sp
+        y = int(random(-7, 8)) * sp
+        si = random(10, 15)
+        sh = choice((ELLIPSE, ELLIPSE, ELLIPSE, ELLIPSE, TRIANGLE, RECT))
+        grids.append(Grid(pos=(x, y),
+                           dims=(d, d),
+                           space=sp,
+                           elem=(sh, si))
+                      )
+        
+def draw():
+    background(240)
+    translate(width / 2., height / 2.)
+    # scale(.5, .5)
+    
+    for g in grids:
+        g.update() 
+        
+    # gif_export(GifMaker, filename="sketch_190806a")
+
+def keyPressed():
+    if key == "s":
+        saveFrame("####.png")
+    if key == " ":
+        create_grids()