Enveloped visitors

1. Does enveloped visitors mean "affected and influenced the visitors" or "surrounded the visitors physically in the exhibition environment"?

2. What does shifting planes mean describing the photograph panels? Does it mean the images of desert changed from photograph to photograph?

Context:

Fait consists of seventy-one colour images, each 101.6 x 127 cm, most of which she took from a helicopter, and showed at Le Magasin at the Centre National d’Art Contemporain in Grenoble, France. The images, placed so as to approximate Ristelhueber’s own experience of the desert, enveloped visitors. As Brutvan notes:
Fait is as much a physical experience as an intellectual and emotional one. Surrounded by the shifting planes, confused by the absence of recognizable scale and loss of perspective in these intentionally abstract details, the viewer is left to his own conclusions, and even with a sense of vertigo.