Have tried 'walk thru' on setting the clock in the square, but the lady robot goes in the door & out again & I just remain there !
When she gets up from her seat you then see that there's a note on the wall where she was sitting.
Jot down the information contained therein and use it well.
P.S. FYI, all the Walkthrough images are archived
here on The Forum (in the General Machinarium topics > Machinarium WALKTHROUGH section)
