Following his failure to protect the Death Star, Emperor Palpatine regarded his apprentice as neither use nor ornament.
Well, maybe not the second part.
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Apprentice's Folly
Sculptor Unknown, 0BBY
Obsidian, Durasteel, Pink Plasteel, Internal Components Unknown

This enigmatic and evocative piece was commissioned by Emperor Palpatine himself in the aftermath of the destruction of the first Death Star and the disappearance of Lord Vader. Following the fall of the Empire, it came to be regarded as a symbol of hope and renewal, of beauty emerging from darkness. It now furnishes the desk of Senator Skywalker.
Considered an exquisite example of Ubrikkian machine-sculpture, its complex mechanisms are tended to each day by maintenance droids.