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.
it has 6 faces. 4 for the long sides and 2 for the ends. A rectangular prism has six faces. Imagine the prism (a standard box, of any dimensions) sitting in front of you. The box has: a TOP face, a BOTTOM face, a face on the LEFT, a face on the RIGHT, a FRONT face, and a REAR face. Count 'em.