最小的三阶魔方？

大烟头

Original Rubik's Cube Keychain - First Edition - 1982

大烟头

这是用边长2厘米的三阶改成边长为1.5厘米的魔方：

摘自：http://twistypuzzles.com/forum/viewtopic.php?t=4831&sid=2421ee708259c3843a3732acb8133c24

制作人Tony Fisher这样介绍的：

I got kind of bored working on Containers today so I thought I'd do something different. I decided to make what is probably the smallest Rubik's Cube in the world (15mm side). Since it doesn't have cubic cubies though I guess technically this is incorrect. I'd like to think however it is the smallest Rubik's Cube type puzzle ever made. In some of the photos there is also a 20mm keychain cube and a regular cube for scale. It was a little tricky to get a professional finish though it works pretty well.

大烟头

这三个魔方边长分别为：5.7cm 、2cm、1.5cm

边长为1.5cm与2.0cm三阶的对比照片：

大烟头

jinyou

边块比角块大

乌木

也就是说，棱块仅两维压缩（各约半个单元），角块三维压缩（各约半个单元），中心块则仅一维压缩。

乌木

下图是我画出来的，棱角压缩，中心块不压缩，不知做得出吗？

大烟头

呵，这样当然能做得出来，更省事一点，也挺漂亮的

大烟头

乌木先生的绘图能力越来越强了，可喜可贺呵

乌木

我是在你14楼的图上添画的。