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To boost the efficiency of solar receivers, Casati turned to semitransparent materials such as quartz, which can trap sunlight -- a phenomenon called the thermal-trap effect.

The cage-like structures pioneered in Oregon are heavy-duty, semitransparent and easy to clean.

Stephen Carney, the cemetery’s command historian, told the committee about a previous plan Arlington National Cemetery’s staff had envisioned, involving a “semitransparent” viewing panel that would, in a sense, transport visitors back in time.

Another work, “Inverted Monument,” looks like an upside-down statue trapped inside a semitransparent pedestal, and is made of extruded thermoplastic polyester threads.

The curtain of “Cloak” is semitransparent — it allows vision and blocks it at the same time, and, if people step behind it, functions as a sort of hiding place.