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<TITLE>Explanation</TITLE>
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<h1>Explanation</h1>
<p>Note that there are twenty-five frames on this page. The entire top and bottom rows (five frames in each) point to an empty page. Then, the first and last frames on each of the three middle rows (an additional six frames) also point to the same empty page.</p>
<P>Only the central nine frames point to the images shown.</p>
<P>Therefore, since the size of the blank frames is variable while the size of the picture frames is constant, it doesn't matter how big the visitor makes the window, the blank frames will expand to fill the space and the central frames will stay together as one stable unit.</p>
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