>>105633674
It's just very precise. That precision, paradoxically, can sometimes make things harder to understand when dealing with unfamiliar problems. But SICP is a book that very much assumes you're willing to sit with the discomfort of often not knowing what the fuck is going on. It wants to believe that you are the kind of person who's willing to work for your understanding if you have to... and I'm tempted to say that everyone has to unless they come in already knowing everything. Even then, I think some of the exercises are just genuinely cognitively taxing in a universal way. There are some aspects which are conceptually challenging and others whose difficulty is in just pure cognition.