Geometry.
Geometry governs origami so this should not be a difficult challenge to think something up for.
From wikipedia:
Geometry is a branch of mathematics concerned with questions of shape, size, relative position of figures, and the properties of space.
However, you do not have to make something that has anything to do with mathematics. The point of this challenge is to emphasize geometric qualities of models. For example:
Roman Diaz's hen:
Jun Maekawa's Santa:
Rebecca Giesking's diagonal shift variant (or any of her models in general):

Beth Johnson's bird:

As you can see these models all emphasize some aspect of geometry.
But do not let that limit your imagination. Tessellations obviously are included in this topic, as well as models that generally have to do with the mathematics, or even models that are about geometry.
For example, Alexander Kurth's "Guardian of the Last Geometry" is thematically about geometry, but also is all about geometry and curves.

It is a very wide theme as you can see.
Rules:
- Any number of sheets or shape of sheets.
- no cutting or adhesive
- MC is allowed for purpose of shaping.
Good luck to everyone!
Marmalade will be the judge for this month.
