Earlier quoted context omitted.
Small burdens are never directly visible. No entrepreneur thinks "If taxes were 5% lower, I'd start a startup." Instead, they think "If I had twice as much savings, I'd start a startup" without stopping to realize they're saving an amount equivalent to 5% of their taxes. In a similar vein, if my video game character gets -10% to speed (or +10%), I typically shrug it off as nothing, but it all too often is the differe…
In my philosophy class, there was something called the Heap Problem: "One grain of sand is not a heap. Adding a grain of sand to something that is not a heap will not make it a heap. By induction, then, heaps cannot exist." The conclusion, of course, is obviously false, because heaps of sand do exist. But you can't state at what point something that's not-a-heap becomes a heap. AFAIK, this was still an open question…
Treating a pile of sand as an accumulation of individual grains which can be precisely abstracted through induction is an unnatural mode of thinking. Without focusing our attention on it, it will remain a single, fuzzy abstraction. That we see no clear distinction between these two modes seems more a neurological phenomenon than a philosophical one.