4-dimensional shapes

Two shapes, sitting on something wooden, made of, I think, pipe cleaners.  The one on the left is a gold-colored tetrahedron with silver-colored lines going to a point in the center.  The one on the right is a cube with a smaller cube inside of it, and the corners of the two cubes are connected; there are many colors in this one, and many of the things are twisted together.

Three-dimensional representations of four-dimensional shapes; specifically, a pentachoron (4D analogue of a tetrahedron), and a tesseract (4D analogue of a cube).