Usually there is something that stops the patrons from actually being in the path of movement. A hand rail, props on the floor, furniture, what looks like shrubs or garbage laying around. It could be the floor is different materials and one is something you would avoid walking on like larger sharp rocks or a pile of bones stacked up.
Another fabulous post from the U.S.Department of Wild Imaginings, now in spectaclar stereo, sponsored by the Adhesives and Sealants Council, suggesting ways to stick things together since the 1800s. Not fabulous in a gay way. Your results may vary. Illinois residents add 8% sales tax. These posts have been made by professional post makers, do not try this type of posting on your own without extensive training, lovely assistants and a trusty clown horn.