There are many models I just HAVE to have in my folio – David Brill’s “Double-Star Flexi-Cube” is one such model:

I first folded this back in my first 365 origami project (the original reason for this blog). At the end of the first 365 I held a charity auction and the original white DSFC provided a rather nice amount for my nominated charities.

I have only just got around to folding it again. This model requires A-series paper proportion, so I decided (insanely) to use A7 sheets, and chose 2 bold colours (red – yes that is RED, my phone camera seems singularly unable to photograph it, and purple) because I had 4 sheets of each. Each A4 sheet is cut into eighths – 64 sheets (32 for each cube)

deliciously, you fold 2 identical stars then, by the magic that is geometric topology and strategically placed “hinges” you can morph a star into it’s own negative (a cube with a star-shaped hole) then nest them inside each other.

I love this to bits, but must admit to having (again) to cheat on this model – the “locks” are not very positive, it tries to pull itself apart and there is little locking it together (bar some overlapping edges, simple flap tabs into pockets etc) – this is a bit of a pity. I used small strategically placed glue spots to stop it exploding every time I even looked at it suddenly.

Flexi-geometry is remarkably satisfying to play with, the geometry of this cluster is delicious.