Talmud (Rodkinson Edition) — Book 2…
“ Rabh said: "I have a tradition, that a ladder standing straight against a wall also diminishes its size, but I know no reason for it." Said Samuel to him: "Does Abba not know the reason for this? Why should a ladder be worse than two benches placed one above the other? Surely it is more difficult to scale a wall by means of benches than by means of a ladder."Rabha in the name of R. Hyya said: "Trunks of Babylonian fig-trees when placed against a wall need not be fastened, because their weight is so great, that it is very difficult to remove them, although they may be handled on Sabbath." ”
