   for (int16_t i=0; i<display.width(); i+=4) {
     display.drawLine(0, display.height()-1, i, 0, WHITE);
     display.display();
+    delay(1);
   }
   for (int16_t i=display.height()-1; i>=0; i-=4) {
     display.drawLine(0, display.height()-1, display.width()-1, i, WHITE);
     display.display();
+    delay(1);
   }
   delay(250);
   

                     display.width()/2-i, display.height()/2+i,
                     display.width()/2+i, display.height()/2+i, WHITE);
    display.display();
  }
}


    if (color == WHITE) color = BLACK;
    else color = WHITE;
    display.display();
    delay(1);
  }
}
   
