Dark Design Patterns. You are undoubtedly familiar with the nuissance they cause, even if you're not also familiar with the term by which they are known. No, this is not a design topic that has any relevance to the colour wheel. Well, not in the way you'd think.
When a company (either accidentally or deliberately) makes a certain action very difficult to accomplish (one that has a negative effect on the company), chances are it falls under the category of Dark Patterns. Have you ever tried to Unsubscribe from something but found it incredibly difficult to find the Unsubscribe button? Dark Pattern. Have you ever tried to contact a company through their website but every links that includes the word "contact" points to something or seemingly anything but a form of contact? Dark Pattern. Only have the option to "Learn More" or "Continue", where the option to decline is hidden under Learn More? Dark Pattern.
Dark Patterns are at their core a hack of our society's social norms. If a company can make it more difficult to unsubscribe, they can increase their subscriber retention. They can hide under the false curtain of legitimacy by being able to say that users can unsubscribe on their website, and while technically and theoretically that may be true, the fact that they've hidden away that feature makes it incredibly unlikely. It exists, but that company has an unspoken intent to hide it from you.
A short perusal of DarkPatterns.org and their Hall of…