For me, the hardest part in creating and making a model is the choice of paper and the most suitable colors! This is a model for which I immediately found the right color combinations: red for the central and black cube for the outer structure. It is a natural consequence of another model (CUBEI), and I loved it for its simplicity of construction of the modules and for ease of assembly. It turns out to be one of my favorite models for the facility of construction and its elegance. I recommend using heavier paper, such as TANT, which provides a tighter lock. As always, for geometric origami, precision is fundamental.