One of the new vinyl reissues of the Doors' two post-Jim Morrison albums from the '70s includes a curio that hasn't been part of the record's packaging in more than 40 years.

The original 1972 version of Full Circle included a foldout zoetrope, an old-school device that produced motion via a cylinder that featured different images. When spun around, the effect produced an early form of animation. You can see it in action in the above video.

According to a press release, the Doors zoetrope "depicts the human life cycle of a man from infancy to elderly." Which makes sense, since the album itself plays on this theme.

Following the death of singer Morrison on July 3, 1971, the three remaining members of the Doors decided to move forward, with Other Voices released in 1971, and Full Circle a year later. Keyboardist Ray Manzarek and guitarist Robby Krieger took over vocals on the songs, which were more jazz-oriented than their earlier work. (The trio released one more album under the Doors name, 1978's An American Prayer, which included previously unreleased recordings of Morrison reading his poetry.)

Neither LP hit the Top 10, unlike the six albums the band made with Morrison, but Other Voices climbed to No. 31 while Full Circle stalled at No. 68.

The albums, which are pressed on virgin 180-gram vinyl and feature faithful reproductions of the original cover art, are available for purchase now. The two records are also available on a two-CD set, with bonus songs not found on the original albums, if you happened to have sold your turntable 30 years ago.

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