Trust, but verify! Unfortunately this statement has become true quite often. Using our mirror film you can look from one room into the other without the person becoming aware of it. All you need is a wall with a glass pane. Just stick the PKI 5435 Mirror Film for Observation onto the pane and it will only be possible to look through it from one side, i.e. the observed person cannot see the observer. Formerly so-called “look through mirrors” were used but with our PKI 5435 Mirror Film for Observation you can decide individually which pane you want to transform.