



"tick": function(pix){
let {x, y} = pix;
deletePixel(x+1, y);
deletePixel(x-1, y);
deletePixel(x, y+1);
deletePixel(x, y-1);
deletePixel(x+1, y+1);
deletePixel(x-1, y+1);
deletePixel(x+1, y-1);
deletePixel(x-1, y-1);
}