Positive can move.

float startX = 210;
float startY = 250;

void setup() {
  size(500, 600);
  frameRate(2);
}

void draw() {


  int sizepc = 85;
  background(#00BFFF);
  noStroke();
  fill(#FF1493);
  rect(startX, startY, sizepc, sizepc); //กลาง
  rect(startX-75, startY, sizepc, sizepc); //ซ้าย
  rect(startX+75, startY, sizepc, sizepc); //ขวา
  rect(startX, startY-75, sizepc, sizepc); //บน
  rect(startX, startY+75, sizepc, sizepc); //ล่าง
  startX = (startX + random(0,1000))%width;
  startY = (startY + random(0,1000))%height;
}