Line

-- 1 - black
-- 2 - gray
-- 3 - red
-- 4 - white
-- 5 - glass

art = {
    {5, 5, 5, 5, 1, 1, 1, 5, 5},
    {5, 5, 5, 1, 2, 2, 3, 1, 5},
    {5, 5, 1, 2, 3, 3, 3, 3, 1},
    {5, 1, 2, 3, 3, 3, 3, 3, 1},
    {1, 3, 3, 3, 3, 3, 3, 1, 5}
}

function buildLine(slots)
    for i = 1, #slots do
      item = slots[i] -- element iz slots
      turtle.select(item)
      turtle.placeDown()
      turtle.forward()
    end
    for i = 1, #slots do
       turtle.back()
    end
    turtle.turnRight()
    turtle.forward()
    turtle.turnLeft()
end

for i = 1, #art do
    buildLine(art[i])
end