Gaslighting is a behavior where things change without you noticing and then someone else denies the changes ever happened. Essentially it's a technique to make someone question their own perception of reality.
Imagine you walk into your normal home and find your hat isn't where you thought you left it. Your normal assumption is that you just misremembered. Now imagine someone sneaks into your house and moves EVERYTHING without you present - your desk is an inch or two out of place. Your pens are in the wrong spot. Your clothes are rearranged. Nothing is bad, but everything is wrong.
Then you ask the gaslighter or someone involved about something they said or did and they deny it ever happened. Once a person starts to question their own perception of reality enough they'll be easier to manipulate.
I actually use it in my games to an extent. The backgrounds change without comment in-game in ways the player will only slowly notice.
Sticking to inks for Day 3 and later (since those aren't colored yet):
www.dropbox.com/s/iuesze4...-%20Kitchen%2001.png?dl=0www.dropbox.com/s/h8m42dj...-%20Kitchen%2002.png?dl=0www.dropbox.com/s/o8mojjr...-%20Kitchen%2003.png?dl=0www.dropbox.com/s/gmn41zc...-%20Kitchen%2004.png?dl=0www.dropbox.com/s/wxt98ri...-%20Kitchen%2005.png?dl=0Gaslighting is best used as a background detail that makes the viewer of your hypnoporn question what they've already seen. Even if it only works for a moment it's great.