  Cube categories are used to encode higher-dimensional categorical structures.
They have recently gained significant attention in the community of homotopy
type theory and univalent foundations, where types carry the structure of such
higher groupoids. Bezem, Coquand, and Huber have presented a constructive model
of univalence using a specific cube category, which we call the BCH category.
  The higher categories encoded with the BCH category have the property that
all morphisms are invertible, mirroring the fact that equality is symmetric.
This might not always be desirable: the field of directed type theory considers
a notion of equality that is not necessarily invertible.
  This motivates us to suggest a category of twisted cubes which avoids
built-in invertibility. Our strategy is to first develop several alternative
(but equivalent) presentations of the BCH category using morphisms between
suitably defined graphs. Starting from there, a minor modification allows us to
define our category of twisted cubes. We prove several first results about this
category, and our work suggests that twisted cubes combine properties of cubes
with properties of globes and simplices (tetrahedra).
