Let's solve this problem with unity in diversity.

He was struggling to understand the concept of a hypercube.

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

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.

The 正十六胞體 is one of the regular polytopes in four dimensions.