small bathrooms. i have kind of a similar fear, but I'm really only scared of small bathrooms, or monochromatic ones or ones with labels and directions as to what to do (like airplane or cruise ship bathrooms) I hate flying because of my fear, and always avoid airplane bathrooms.
A rectangular prism is solid 3-dimensional object which has six  faces that are rectangles. It has 12 edges and 8 vertices.
Hexagonal prism. In geometry, the hexagonal prism is a prism with hexagonal base. This polyhedron has 8 faces, 18 edges, and 12 vertices. Since it has eight faces, it is an octahedron. However, the term octahedron is primarily used to refer to the regular octahedron, which has eight triangular faces.