Sonobe

The other day I was playing with papers. Suddenly remembered what I used to make as a kid! Googled that thing and got a word "SONOBE".
The Sonobe module is a unit used to build modular origami, created by Mitsonobu Sonobe. Each individual unit is folded from a square sheet of paper, of which only one face is visible in the finished module. Here is a simplest sonobe module which I will be making lots of them over the next few days.
Sonobe units form complicated shapes with interlocking multiple units.

Below is the plans of basic sonobe.