-- 0 - nothing
-- 1 - obsidian
-- 2 - stone
art = {
    {{1, 2, 2, 2, 1},
    {2, 0, 0, 0, 2},
    {2, 0, 0, 0, 2},
    {2, 0, 0, 0, 2},
    {1, 2, 2, 2, 1}},

    {{2, 0, 0, 0, 2},
    {0, 0, 0, 0, 0},
    {0, 0, 0, 0, 0},
    {0, 0, 0, 0, 0},
    {2, 0, 0, 0, 2}}
}

for depth=1, #art do
    turtle.up()
    for row=1, #art[depth] do
        for column=1, #art[depth][row] do
          slot = art[depth][row][column]
          if slot == 0 then
            turtle.forward()
          else
            turtle.select(slot)
            turtle.placeDown()
            turtle.forward()
          end
        end
        turtle.turnLeft()
        turtle.forward()
        turtle.turnRight()
        for column = 1, 5 do
          turtle.back()
        end
    end
    turtle.turnRight()
    for row=1, #art[depth] do
        turtle.forward()
    end
    turtle.turnLeft()
end