By Katie Holdefehr As times change, it's inevitable that certain interior design concepts that were coined decades (or even centuries) ago no longer apply. Now that it's 2020, the new decade is prompting us to reconsider some potentially outdated decor ideas. From the tropes of the "masculine" bachelor pad or the limiting concept that only certain colors "go together," we're reevaluating a few design ideas that are all too easy to take for granted.