The viewer becomes aware of ...

The viewer becomes aware of himself and of his movement through the plaza. As he moves, the sculpture changes. Contraction and expansion of the sculpture result from the viewer's movement. Step by step the perception not only of the sculpture but of the entire environment changes.
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 Richard Serra

Quotes from the same author

I think you always have to find where the boundary is in relation to the context in order to be able to kind of articulate how you want the space to interact with the viewer.
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 Richard Serra
When I moved into making sculpture, I could handle steel the way it had been handled in the technological revolution. I could use it the way bridge builders used it; I could use it the way they used it in industry and building and not the way it had been used in art.
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 Richard Serra
Time and movement became really crucial to how I deal with what I deal with - not only sight and boundary, but how one walks through a piece, and what one feels and registers in terms of one's own body in relation to another body.
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 Richard Serra
Promenade was totally driven by the context. The internal relationships of measurement and placement related to the central axis of the site. The placement of the rectangular plates followed a strict logic in that the plates tilted away and towards the center line in an asymmetrical counterpoint. However, the perception of the sculpture contradicts the logic of its relation to the site. As you walk inbetween the plates you see fragments, you see the work in part, you cannot grasp the whole.
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 Richard Serra
I thought Out of Action was better as a catalogue than the honeycomb because the honeycomb was like walking into one compartment and then another compartment.
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 Richard Serra