- Black rectangle of size (4, 9, 1)
- Convenient because the dimensions are obvious to see.
- Original source: [Monolith (2001: A Space Odyssey) - Wikipedia https://ja.wikipedia.org/wiki/%E3%83%A2%E3%83%8E%E3%83%AA%E3%82%B9_(2001%E5%B9%B4%E5%AE%87%E5%AE%99%) E3%81%AE%E6%97%85)]
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