however, if you took that white space, you would not recognize it as a whole as letters, wheras the black gaps can be completely distiguished as letters, however, you are right in saying your brain is interpreting them as letters. there are letters in it, but the shape itself is not a letter, just like a shaded circle can have letters in it, but it as a whole is not a letter. also, how is SEEING stuff on a screen have nothing to do with letters? please show me how seeing stuff and its interpretation have nothing to do with letters. also, some people find it hard to discern the "letters" in the white space, it takes me some time to do it.
also, interpretation has a lot to do with senses, seeing is just electrical signals, your brain has to interpret those signals as an image. same with pretty much all senses.
and i will give you one example of senses can be fooled
have you been to those circular raft rides. if you stood on the spinning ring around it, you would see the middle spin, while you stay still, but if you were to stand on the still center, you would correctly see the spinning disk. i myself have seen this happen, and also this can be applied to the sun's movement. the sun could be spinning, or the earth can, while the sun moves back and forth. if you were on the sun, you would probably see the earth move, and if you were on the earth, you will see the sun move
also, i dont remeber you original premises, sorry, again, too lazy to lurk