A chair is not a simple thing, designs number in the thousands. Outdoor options which come to mind include the metal frame with the round back from the 50’s, the folding aluminum frame with the woven strips, and the more recent molded plastic. None of those were at Floriade!
A pair of granite block style chairs prove to be cushy high density foam.
A plush recliner looking like it was left out in the rain is concrete.
A yellow tulip opens and you may sit inside.
A basket reveals a cushioned love seat.
Rock filled wire frames provide a seat that will not blow away in the wind.
Contemporary red & black frame lets you sink in, not sure it will catch on.