In cargoland there are numerous tall buildings, many being 50
floors
and greater in height. Although most of these vertical
monstrosities
are vulgar eyesores, they nevertheless present the perfect
opportunity to facilitate the idea of having A Long Slow
Comfortable
Swing.

To complete
the proposal, all that's required is an area of obstacle
free public space immediately adjacent to a very tall building. A
substantial horizontal girder can then be added to one of the
uppermost floors, projecting outwards and overhanging the space
below. Attached to this girder are pairs of hanging chains, each of
which terminates in a very comfortable seat positioned a few feet
from the ground.

This are the seats that provide for their relaxing occupants the full
experience of A Long Slow Comfortable Swing, as they lazily
oscillate
backwards and forwards, confirming the periodic time of the most
satisfying of equations: T = 2 x pi x the square root of L / G

If two buildings are near each other and both are at least a
suitable height (they don't have to be the same height;
they just need to be a minimum height), then some sort of
girder spanning the gap between the buildings could be
installed, and several swings hung from it.

Better make it pretty heavy or basically rigid because otherwise the slow and comfortable is going to be replaced with violent harmonics and lethal responses to slight breezes, breezes found to be frequent near large structures.

Some time ago, I built a super-duper swing
suspended from
the branch of a beech tree - it was about 40ft
long. It then
transpired that it is almost impossible to generate
swingth
with such a long rope, unless either someone
pushes you or
you can scrabble your feet along the ground.

I suspect that this problem could be overcome by
having
some sort of motorized cam that moved the
attachment
points back and forth at exactly 2 x pi x root L / G