This reindeer, designed by Satoshi Kamiya (the designs for his models can be found here) was folded by Maxi Purewal from crease pattern – without diagrams.
A fold in a sheet of paper can be thought of as an isometry of a surface in three-dimensional space. This means origami models that can be created without glueing or cutting are subject to strict rules of geometry. Therefore, the creases made in the square sheet when flattened (the 'crease pattern' on the left) encode all of the information needed to fold the completed model (the finished product on the right is just the ‘collapsed’ crease pattern with artistic shaping).
Maxi Purewal is an undergraduate student at Worcester College.