one digital bird in the cage
There is a digital bird in a traditional cage. He is singing freely inside a screen. On the introduction of the bird before cage, there is a hidden eyelet camera. When there is a visitor coming to look at the digital bird, the image of the bird will be gone, and instead, the image of the visitor will be shown on the screen. Once the visitor has left, the digital bird will be back to the screen again.
The computer will control the installation.