int r = 0;
int state = 0;
void setup()
{

frameRate(10);
background(255,255,255);
size(700,700);
}

void draw()
{
background(255,255,255);
fill(122,122,122);
if (state == 0) r++;
if (state == 1) r--;
if (r < 50) state = 0;
if (r > 250) state = 1;
for (int i = 0; i < 10; i++)
{
ellipse(int(random(250))+250,int(random(250))+250,r,r);
}

}