Here's an excerpt from The Introduction to Poetry 4th dition, by X.J. Kennedy:
Sometimes an unconventional looking poem represents no familiar object but is an attempt to make the eye follow an unaccustomed path, as in this experiment by E.E. Cummings.



R-P-O-P-H-E-S-S-A-G-R

r-p-o-p-h-e-s-s-a-g-r
who
a)s w(e loo)k
upnowgath
PPEGORHRASS
eringint(o-
aThe):l
eA
!p:
S a
(r
rIvInG .gRrEaPsPhOs)
to
rea(be)rran(com)gi(e)ngly
,grasshopper;