duality up and down half split | 二元性——上下

第二版昨天 7/17 做出来了，但是效果和我预想的差得远，不过，玩玩还是可以的。upside-down实在挺难生成的。

长宽比大于或等于二比一。

The second version was created yesterday, 17th July. However, the result is far from what I had anticipated. Nonetheless, it's still enjoyable to play around with. Generating the upside-down effect was quite challenging.

The aspect ratio is greater than or equal to two to one.