Walls have ears, paper sliding doors have eyes.
More Japanese Proverbs:
To know and to act are one and the same.Japanese
A merchants happiness hangs upon chance, winds, and waves.
Japanese
Darkness reigns at the foot of the lighthouse.
Japanese
It is easy to die -- the difficulty lies in living.
Japanese
A bath refreshes the body, tea refreshes the mind.
Japanese
The guest who seeks special attention muddies the host's tea.
Japanese