size(400, 400);
background(6);
stroke(255, 201, 3);
smooth();
rectMode(CENTER);

int shapeSize = 400;
int kindOfShape = 0;

while(shapeSize > 10){

if(kindOfShape == 0){

fill(250,  250, 250);
ellipse(200,200,shapeSize,shapeSize);
kindOfShape = 1;

}else{

fill(250,  30, 100);
rect(215,115,shapeSize,shapeSize);
rect(200,200,shapeSize,shapeSize);
rect(115,100,shapeSize,shapeSize);

kindOfShape = 0;

}

shapeSize = shapeSize - 10;

}