Robot

Forward = {x=0,y=0,z=0}
function shift(direction)
    if direction=="right" then
        print("shifting direction right")
        if Forward.x==1 then
            Forward.x=0
            Forward.z=1
        elseif Forward.z==1 then
            Forward.x=-1
            Forward.z=0
        elseif Forward.x==-1 then
            Forward.x=0
            Forward.z=-1
        elseif Forward.z==-1 then
            Forward.z=0
            Forward.x=1
        end
    end
    if direction=="left" then
        print("shifting direction left")
        if Forward.x==1 then
            Forward.x=0
            Forward.z=-1
        elseif Forward.z==-1 then
            Forward.x=-1
            Forward.z=0
        elseif Forward.x==-1 then
            Forward.x=0
            Forward.z=1
        elseif Forward.z==1 then
            Forward.z=0
            Forward.x=1
        end
    end
end
for i = 1,20 do
    print("Forward")
    for i,v in pairs(Forward) do
        print(i.."="..v)
    end
    shift("right")
    sleep(1)
end