Ludwig Wittgenstein's duck /rabbit. 
You can either see the rabbit or see the duck.. You can either see one of them or the other at a time.. You can't  see the two simultaneously and realize that they are actually identical at once.. Only in a linear process of going through one and then other.. And then having the Insight "oh its not a rabbit OR a duck.. It's both simultaneously and only one of them relative to a certain perspective".  If this is understood.. Basically you don't have to read a single word in epistemology looking for the truth in this OR that.     Not- two.  Reality Is the rabbit - duck!!