That was kind of tough. I dunno really. you just have to get the head to go from one side to the other in a continuous motion using the lines. he has to hit the buttons on either side which unlock the door.
I get the chair part, how do i arrange the tiles under the bridge?
The lines have to go from one end to another so the head can travel through it. The door then will be unlocked. After so pull the staris down by clicking on that sphere things and continue.