Each layer of the soil. Each block of the stones.The plants we pick. Or the way we place each piece of the rocks. Every little element is different. Everything needs a little different something.
Tilladsia is an air plant, tolerant to dryness, easily to take care, no material needed to raise, can be hung or left it in a right place.It has tiny while cells called Trichorme that absorbs humidity and nutritions from air.