It has 0 physical features
This shape would be a rectangular prism, with 4 rectangular sides, and 2 square or smaller rectangular sides.
An example of a rectangular prism would be a brick. It has 4 sides that are perfectly alike, then two other sides that are like each other.
A horizontal asymptote of a function f(x) is given by y = lim f(x) as x --> ∞ and x --> –∞. In this case,

Thus, the horizontal asymptote of f(x) is y = –2.