In geometry, a tesseract or 4-cube is a four-dimensional hypercube, analogous to a two-dimensional square and a three-dimensional cube. Just as the perimeter of the square consists of four edges and the surface of the cube consists of six square faces, the hypersurface of the tesseract consists of eight cubical cells, meeting at right angles. The tesseract is one of the six convex regular 4-polytopes. The tesseract is also called an 8-cell, C8, (regular) octachoron, or cubic prism. It is the four-dimensional measure polytope, taken as a unit for hypervolume. Coxeter labels it the γ4 polytope. The term hypercube without a dimension reference is frequently treated as a synonym for this specific polytope.
This has nothing to do with the cache, but tesseracts are pretty cool. You are looking for a bison container with just a log. There is room for small items. Please excuse the plain paper log! This cache was a spontaneous one and I didn't have official looking logs with me.
This cache is NOT in a rat trap, please don't hurt yourself!