4U
design: 2004
woodwork: Woodpecker, Hikimi
fabrication: 2007-2013
Four pieces are identical, U-shape. The goal is to pack all of them within a square frame.
This looks very simple, but not so easy to pack the pieces.
![](01.jpg)
Its instruction includes bonus challenge, which you can play with only the pieces.
![](02.jpg)
Early making (crafted by Yamada Woodwork): thin pieces and a case with a bottom plate.
![](03.jpg)
4U
designed by Kohfuh Satoh, 2004
crafted by Woodpecker, Hikimi
released from Kohfuh Satoh/kofth, 2007-2013