Figment

There are 15 Doors you can knock on in Clockwork Town. There a re 4 in Clockwork Junction, 1 in Enigma Hill, 2 in Planning Plateau, 4 in Composition Road, 3 in Geometry Square, and 1 in the Clock Tower. The door locations are all listed below (with a snippet of their dialogue) in the order they appear:

Clockwork Junction:

• When the path splits, take the left pipe up to where the Blue Battery is... "Oh my, white gooey stuff everywhere..." This house is also the location for Memory IX
• Just to the left of the first two pendulums you run into... "No answer!..."
• The building just behind where you find the Train of Thought... "Welcome to the Clockwork Junction..."
• After you give the Train of Thought a kick, you'll follow it into Enigma Hill, but will need to go up a lift to do so. Just at the top of the lift is the house... "These days, the problems here in Clockwork..."

Enigma Hill

• When you place the Enigma Box to raise the gear, walk across it and there will be a short cutscene. The house just to the right (you'll have to fight a bunch of Spiders here)... "Hey... why is 1/5 so stressed..."

Planning Plateau

• After you push the Train of Thought the first time, on the next platform he stops on is the house... "The equation train drives again..."
• The big gear house with the record... *The dialogue here will vary depending on when you knock on the door, just make sure you knock on the door before you collect Memory XI*

Composition Road

• On the side of the large organ house... "Let me tell you this..."
• On the small ledge with the bottle opener... "[incomprehensible gibberish]..."
• The house just below where you clear the steam to find the piano solution on the green rock (after the two pendulums)... "Nobody seems to be at home..."
• The house releasing the steam that's covering the piano solution on the rock with the green symbol... "Steam-Boy Bennet..."

Geometry Square

• At the first split, go left and then up the left pipe. The small house on the next ledge... "Tread carefully my friend..."
• Instead of going up the left pipe, go up the right ramp. At the top of the ramp are two houses... "Ja!", "Nah-ah", "Nah...", or "Jaeh" This is also the location of Memory XV

The Clock Tower

• Immediately to your left when you enter the area... "Ze spider have taken over ze clock tower..."