It's a wicket pole ladder. But instead of alternating coplanar arcs... there are three times the arcs! And they are opposite each other and set at 120 degrees relative to each other!
A climbing element with two vertical supports that angle toward the platform with steps created by metal squares with rounded corners attached to the supports .
A standalone element consisting of two semicircular metal arches anchored in the ground with metal rungs connecting the arches where the structure twists so that all the anchor points are colinear on the ground.
