n=200
r.f=#PI*2/235
x.f=0
y.f=0
v.f=0
t.f=0.22
s=240/2
If InitSprite() And OpenWindow(0,0,0,640,480,"Bubble Universe",#PB_Window_SystemMenu) And OpenWindowedScreen(WindowID(0),0,0,640,480,0,0,0) 
  Repeat 
    StartDrawing(ScreenOutput()) 
    Box (0,0,640,480,0)
      For i=0 To n Step 2
        For j=0 To n Step 2
            u.f=Sin(i+v)+Sin(r*i+x)
            v.f=Cos(i+v)+Cos(r*i+x)
            x=u+t
            col=RGB(i*2,j*2,99)
            Box (320+u*s,240+v*s,2,2,col)
        Next j
    Next i
    t+0.025
  
    StopDrawing() 
    FlipBuffers() 
  Until WindowEvent()=#PB_Event_CloseWindow 
EndIf