该项目中，设计师首先通过大量阅读与研究明确了物体旋转的条件。对于陀螺来说，轴线与重心、重量以及尖端形状一样重要，本设计即采用了将设计旋转轴和自身旋转轴相结合的策略。
Perusing published reports and books to study conditions that would make an object spin cleanly made something clear: matching the axis on which the object is designed to spin, and the axis on which it will spin most easily, is as important as conditions like center of gravity, weight, and tip shape.
▼设计草图，concept sketch © nendo
陀螺与平面相接的尖端与手柄落在同一条直线上，如此，使用者也将自然而然地按照这条轴线转动陀螺。
The axis on which the object is designed to spin is essentially a line connecting the point at which it touches the underlying surface and the handle by which it is spun. It is, more or less, the interface through which someone intends to spin the object.
▼产品概览，overview © Akihiro Yoshida
▼使用示意，the using scene © Akihiro Yoshida
陀螺上惯于旋转的轴线也称惯性主轴，它广泛存在于物体之中。将这条自身旋转轴与设计旋转轴保持在同一直线上，便可以减轻陀螺的晃动，使其旋转更长时间。
Meanwhile, the axis on which it will spin most easily is also called the major principal axis of inertia. Such a state exists for any object anywhere. Making these two axes one and the same prevents immediate wobbling and enables the object to spin longer.
▼旋转的陀螺，the spinning top © Akihiro Yoshida
当满足了旋转的四个先决条件，设计便能够从对称的审美中解放出来。设计师没有采用对称结构、旋转体以及曲线，而是将陀螺设计成了看似不易旋转的随机线条组合，仅通过在内部放置黄铜配重满足其旋转要求。
What this means, conversely, is that with these four conditions met, aesthetic symmetry becomes less relevant. That being the case, it was decided to make a form composed of random straight lines that appears most unlikely to spin, with no apparent symmetry, no rotating body or curves, and turn it into a spinning top by placing some brass weights inside.
▼陀螺与黄铜配重，the top and the brass weights © Akihiro Yoshida
设计师采用名为“遗传算法”的计算程序对重心、重量、尖端形状以及轴线这四个关键条件进行了评估，使设计旋转轴和自身旋转轴处于同一直线，最终推敲出形状以及配重数量与位置的最佳组合。
Using a computational procedure known as a genetic algorithm, the four conditions were evaluated—center of gravity, weight, tip shape, and the axis by which the top is both designed to be spun and easiest to spin, so as to find the optimal combination of the object’s shape and the weights’ position and amount.
▼旋转的陀螺保持稳定，the spinning top remaining stable © Akihiro Yoshida
设计团队采用3D打印技术，在生产过程中对不同计算方案进行了验证，通过200多次、100多种组合的比对，最终筛选出能够旋转10秒以上的陀螺。
With a 3D printer to physically verify and validate results to be reflected in the program, and a hundred combinations attempted over 200 times, a top capable of spinning for more than 10 seconds was produced.
▼多方位展示，different views of the top © Akihiro Yoshida
▼细部，detail © Akihiro Yoshida
Collaborator : fuk, nis Photographer : Akihiro Yoshida Filming + Editing : mit
