Fallacy of misplaced concreteness is when you take an abstract idea and treat it as if it was a real physical thing. For example, if you believe that you can hold success in your hand like you can hold a ball, that would be fallacy of misplaced concreteness. You can't actually hold success in your hand because it is an abstract concept. It's something that you need to work hard for, but it doesn't have a physical form.