This old book is written in old-style characters.

The term '異體字' refers to Chinese characters that have the same meaning but different forms.

This company is advancing the process of unification.

He is writing a thesis on fluid dynamics.

The tesseract represents a four-dimensional geometric shape.

The 正五胞體 is a simple convex polytope in four dimensions, having five vertices.

He made a model of a dodecahedron.

This regular tetrahedron is composed of equilateral triangles on all sides.

This chamfered cube is one of the shapes in mathematics, and it has the characteristic that all faces are equal.

He is trying to understand the concept of Trinity in Christianity.