Catwalk and Chapter Ending
On the catwalk make your way towards the door with the Flower around it. There is nothing to fear here so no need to be worried. Continue forwards towards the door.
Gray Tape (Optional)
Along the main path on the catwalk you will find the Gray Tape. It is sitting in the final T you need to take to reach the Flower door. If you wish to collect it pick it up and take a right. Take it and place it in the Gray VCR at the end of the catwalk.
The rest of the chapter is linear in fashion. Go through the Flower door and follow the hallways until you reach the very end. In the final room you will see a doll in a glass case. Use your hands to open the case. Once the doll is freed Chapter 1: A Tight Squeeze comes to an end.