Syberia - The World Before - Oscar Path Puzzle

I discovered one evening, completely by chance, an outside staircase, absolutely fantastic, which will have slightly influenced the appearance of the Roze's.

It's the one of the Palais Royal theater in Paris, I invite you to have a look, it's really charming :)

This part is played from the point of view of Oscar, that poor little thing.

Details on the opening mechanism and animation proposal.