A series of identical blocks.
A series of identical rectangular blocks is stacked out at their
balancing points from the top down. You can
show with a simple center of mass calculation the total "stick-out" distance;
that is, the horizontal distance from the back of the bottom block to the back of the top
d = ½(1 + ½ + ⅓ + ¼ + ...)
Thanks to @fnoschese for finding these.