To add an AC outlet, for example, you just drill a circular hole in the wall, tap into the wiring, add the outlet and you're set. If you don't want it, pull it out and plaster over it with more earth to seal the hole.
“Realism is not a matter of any fidelity to an empirical reality, but of the discursive conventions by which and for which a sense of reality is constructed.”
“Success produces confidence; confidence relaxes industry, and negligence ruins the reputation which accuracy had raised.”