Three of the images are inspired by the Necker cube, a two-dimensional drawing of a cube that can be understood in two ways: either with the bottom left face at the front, or the top right face at the front. Once your eyes settle on one interpretation, it is hard to see the other.
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Slices a tuple type.
Что думаешь? Оцени!，详情可参考电影
let position = POS[vertex_index];