
is a 4x4 Area Magic Square with Vertical Lines (VLAMS):  the 16 entries are different natural numbers,  the 4 rows, the 4 columns and the 2 diagonals sum up to the same result (=100).  there exists a geometric square (with side length 20 here), which can be divided into 16 trapezoids by 3 vertical and 3 skew straight lines, such that every VLAMS entry is exactly the area of the corresponding trapezoid. 
Observation 2 For every VLAMS with smallest entry a und greatest entry N the magic sum is 2(N+a).
There are 8 pairs of entries with sum N+a. If both entries of such a pair are connected by a line, then the "connection figure" of the
VLAMS is formed: the VLAMS is a magic square of Dudeney Typ VI. Reflection at a vertical or horizontal central line or a 180 degree rotation of any VLAMS results to a VLAMS again. 
William Walkington:  Area Magic Squares of Order4 
Walter Trump:  Area Magic squares 