Create an array for these rectangles in processing.

int rec = 50;

void setup() { size( 810, 810 );

}

void draw() {

fill(150); rect(380, 200, rec, rec); rect(290, 110, rec, rec); rect(200, 110, rec, rec); rect(470, 110, rec, rec); rect(560, 110, rec, rec); rect(650, 200, rec, rec); rect(650, 290, rec, rec); rect(650, 380, rec, rec); rect(560, 470, rec, rec); rect(470, 560, rec, rec); rect(380, 650, rec, rec); rect(200, 470, rec, rec); rect(290, 560, rec, rec); rect(110, 380, rec, rec); rect(110, 290, rec, rec); rect(110, 200, rec, rec);

}

}