A large circle rotating in five steps and a small circle rotating in six steps.

• Inventor: Dmitry Andreev
• Mechanism: Intersecting circles
• Patents: Unknown
• Producer: 3D printing service
• Year: 2023
• Original Price: $0.00 USD
• Current Price: No Data

Pleione is a binary star and the seventh-brightest star in the Pleiades star cluster (Messier 45). It has the variable star designation BU Tauri (BU Tau) and the Flamsteed designation 28 Tauri (28 Tau). The star is located approximately 138 parsecs (450 light-years) from the Sun, appearing in the constellation of Taurus. Pleione is located close on the sky to the brighter star Atlas, so is difficult for stargazers to distinguish with the naked eye despite being a fifth magnitude star.

The brighter star of the Pleione binary pair, component A, is a hot type B star 184 times more luminous than the Sun. It is classified as Be star with certain distinguishing traits: periodic phase changes and a complex circumstellar environment composed of two gaseous disks at different angles to each other. The primary star rotates rapidly, close to its breakup velocity, even faster than Achernar. Although some research on the companion star has been performed, stellar characteristics of the orbiting B component are not well known.

In the best-selling 1955 nature book published by Time-Life called The World We Live In, there is an artist's impression of Pleione entitled Purple Pleione. The illustration is from the famed space artist Chesley Bonestell and carries the caption: "Purple Pleione, a star of the familiar Pleiades cluster, rotates so rapidly that it has flattened into a flying saucer and hurled forth a dark red ring of hydrogen. Where the excited gas crosses Pleione's equator, it obscures her violet light."

Given its mythical connection with sailing and orchids, the name Pleione is often associated with grace, speed and elegance. Some of the finest designs in racing yachts have the name Pleione,and the recent Shanghai Oriental Art Center draws its inspiration from an orchid.

Pleione was an Oceanid nymph of Mount Kyllene in Arkadia (southern Greece), one of the three thousand daughters of the Titans Oceanus and Tethys. The nymphs in Greek mythology were the spirits of nature; oceanids, spirits of the sea. Though considered lesser divinities, they were still very much venerated as the protectors of the natural world. Each oceanid was thence a patroness of a particular body of water — be it ocean, river, lake, spring or even cloud — and by extension activities related thereto. The sea-nymph, Pleione, was the consort of Atlas, the Titan, and mother of the Hyas, Hyades and Pleiades.

In addition, Pleione is the name of a variety of orchids, mostly purple.

The inventor turned Pleione into a series of puzzles designs.
The distinctive feature of these puzzles is the principle of their numerical designation and several possible variants of puzzles.
A distinctive feature of Pleione are unfinished curvilinear "triangles".
The "triangle" consists of two corners marked in green and three petals marked in yellow.
One of the "triangles" is located partly in the intersection sector of two circles, partly on one of the circles.
The first digit in the name is the multiplicity of rotation of the circle on which this smaller part of the "triangle" is located.
The inventor presented designs indexed 47, 49, 56, 57, 58, 65, 75, 77, 78.
As a first step the designer presented 56 and 65 simultaneously.
Size: 87 x 123 mm
Weight: 96 grams

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