1×1.618 (golden ratio) 2×3 (Folio) 1×√2̅ (A4) 3×4 (Octavo) 8.5×11 (Letter) 1×1 (square)
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You can resize the page by dragging the lower right corner of the page. See The Secret Law of Page Harmony for a description of the construction.
This is a typographic experiment by Manuel Strehl.