Dear Hurkyl,
I hope that by this post we (maybe for the first time) will communicate between our different perceptions about the infinity concept.
First let us take the model of a line and I mean a smooth line without any points or segments (what you call intervals) included in it.
Zoom-in 1x2, 1x3, 1x4, 1xn, 1xn+1 ... and you find the invariant self similarity 1.
In a more formal way |{__}| = 1.
Now, let us talk on what you call the "real-line" of R collection.
The real line of R collection is not {__} form but {...} form.
Shortly speaking, we can find unique elements only in {...} form.
Only in {...} form we can find a one-to-many relation , and if we take your private case of 1/4, 1/8, 1/16, ... then our one-to-many relation has the invariant 1/2 which is exactly the invariant of a Binary Tree on infinitely many scales of it.
Shortly speaking, R collection cannot be but a {...} form.
Your conceptual mistake is that you take R collection as {__} form.
But {__} is a representation of what I call an "actual infinity", and cannot be used as an available information for Math language, or in other words, it is the strong limit of Math language.
Shortly speaking, R collection cannot use the word "line" because no infinitely many points or segments(=intervals) can be a solid line.
From a symmetry point of view, the opposite of the strong limit {__} is the weak limit, which is notated as {} content.
Please look again my major theorem:
http://www.geocities.com/complementarytheory/Theory.pdf
And please give your detailed remarks.
Yours,
Organic