Zero Papercraft

Here is a paper craft you could attempt on your free time. If I could get my hands on some good quality paper, it would last forever! Click the links with these tags "の設計図" to access the Cut-Outs.

I've always preferred Zero over X. Well, that's just me.

Fido Puzzle?

Do you remember this guy? He's been lost in the history books for ages. Here's something he could do, although I wouldn't really call it a puzzle. More of a math trick.