With certain site-specific installations, the art has been created with its architectural environment in mind.

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In a statement, the Arts Council of Wales told BBC Wales it had a legal agreement with the landowner to ensure that members of the public could visit the art installations on the site, and that this agreement existed beyond the life of the Cywain centre.

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In addition, the United States must develop a systematic approach to the security of its sensitive installations under on-site inspection regimes.

CENTERFORSECURITYPOLICY: Center for Security Policy | An Assessment Of Future Requirements For US Strategic Forces And Strategic Arms Control