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The following text describes the artwork Hang Up by Eva Hesse which could be viewed in the image below.

1. Does "which" in the description refer to "a weird loop" or "the variable shadow"?

2. Does the blue highlighted sentence mean "the bumped steel wire implies a sense of an enclosed space which is continuously undermined by the way that the dual loop between the wire and its shadow (being simultaneously material and immaterial) represents this obscure space as a continuous cycling space between materiality and immateriality" ?

Description:

Hang Up, 1966, which Hesse deemed her most successful attempt to create ‘a big nothing’, creates a weird loop between the protruding steel wire that erupts from the top and bottom opposite corners of a wallmounted frame and the variable shadow it casts on the floor, which depends on gallery light and the position of the viewer. The steel protrusion implies a barred sense of space which is continually being undermined by the way the (im)material loop between steel and shadow suggests a continuous encircling of this zone of obscurity.
(source of the image )
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Yes, 'which' refers to the shadow.


and yes, your description of what is written in blue is correct.

Comments  
catttt1. Does "which" in the description refer to "a weird loop" or "the variable shadow"?

It seems to refer to the shadow, but it is poorly worded and punctuated for that. Clearer is "creates a weird loop between the protruding steel wire that erupts from the top and bottom opposite corners of a wallmounted frame and the variable shadow it casts on the floor that depends on gallery light and the position of the viewer."

catttt2. Does the blue highlighted sentence mean "the bumped steel wire implies a sense of an enclosed space which is continuously undermined by the way that the dual loop between the wire and its shadow (being simultaneously material and immaterial) represents this obscure space as a continuous cycling space between materiality and immateriality" ?

Your guess is as good as mine. I don't know what a barred sense is. But the steel protrusion is the wire itself, not any bump on it,