Hallway and Medium Hardwood Floor "One of the great surprises is the acoustic environment," Simmons says. "These are all hard surfaces and you get a bit of reverberation, but the corrugated walls help to disburse sound, so you don’t really get an echo. It actually has a kind of warm sound."  Photo 9 of 13 in A Colorado Firefighter Built His Own Shipping Container Home, and Found a New Calling Along the Way