In [Fig. 16] the line AB is the vertical axis of the page.
Fig. 16. Type page, symmetrical with respect to its vertical axis.
Fig. 17. Page arranged for variety. Not symmetrical on either axis.
This arrangement is frequently used in advertising display,
but is rare in book work.
It is rarely possible that the printed page can be symmetrical with respect to its horizontal axis. Such a state would involve a division of the page below its optical center and would also have an uninteresting division of its spaces, with equal masses above and below. It should be noted that symmetry on the vertical axis permits full variety in the size of the masses used.