More about La Ora SteloTM


Jacques Ferroul is a prolific puzzle designer and creator of utterly beautiful tilings. Kadon has produced several of his designs, including Poly-Spidrons, Tetrapentos, and Stelo.

During the 2007 Christmas holidays, Jacques was vacationing in the Alps. On December 26, he learned of the death of a friend, Jean-Pierre Puisais-Hée. On the 27th, Jacques was in Marseille for his friend’s funeral. At the far end of the church, where the ceremony was taking place, Jacques noticed a large gold-colored star, perhaps part of the church’s Christmas decorations.

Because the death of his friend weighed much on his heart and mind, he turned his thoughts to the star and there, in a few seconds, he visualized it cut into several pieces. On the 28th he returned to the Alps, and by the 29th, La Ora Stelo (Esperanto for The Golden Star) was ready, with many solutions for pentagons, diamonds, kites and more...

La Ora Stelo is herewith dedicated to Jean-Pierre Puisais-Hée.


The tiles of La Ora Stelo are an original polyform set, the polyores, based on the two golden triangles shown here. At left is the "wide" isosceles triangle, with angles of 36-108-36; at right is the "tall" isosceles triangle, with angles of 72-36-72. The base of the wide triangle matches the sides of the tall, and the base of the tall matches the sides of the wide:

These tiles come from dissecting a pentagon, and they share the pentagon's golden-ratio and non-periodic characteristics. The lengths of their sides are related by the golden ratio (an endless decimal beginning with 1.6180). They also occur within a tiling in a frequency that matches the golden ratio, with about 5/8 tall triangles and 3/8 the wide triangle.

Note the difference between La Ora Stelo's building blocks and those in our Collidescape sets, wherein the sides of the two triangles are the matching length. These occur in the reverse ratio of 5/8 wide and 3/8 tall because their wide triangle is actually the size of two unit polyore triangles joined (the order-2 polyores triangle shown in the first row below).

Jacques derived the polyores by combining the unit triangles in length-matched groupings from one to twos and threes. Here are all 32 shapes of polyores orders 1 through 3:

This complete set contains 42 each of the two unit triangles. In solving the wealth of designs provided, you will not always need to use the full set. Each design will demand its own inventory. A large collection of beautiful shapes will use just 25 pieces.

This puzzle is made for Jacques Ferroul and for you by special order. We laser-cut it from transparent tinted acrylic in jewel colors. The Lucite cut edges glow and make it easy to see the divisions between the individual pieces. Color arrangements may vary. If you have a preference for all pieces in one solid color—we offer topaz (transparent yellow) and aqua (transparent green)—please indicate your choice in the special instructions space of the order form. Otherwise we will ship the 8-color ensemble.

The tray has 9 rings on its floor, and you can use them to form ascending sizes of pentagons, rhombs, trapezoids and embedded stars. See Jacques' webpage for the entire and growing collection of themes and challenges. Recommended for ages 10 to adult.   $65

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Try these prize competitions:
  • La Ora Stelo Trapezoid Challenge
  • Contest 2 with three new figures


    See also Jacques Ferroul's TetrapentosTM and Poly-SpidronsTM and SteloTM

    Visit Jacques' page (in French)
    for many other great polyform explorations
    .



  • Product Index Pentagon Universe More about polyforms Jacques Ferroul's page

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