When we talk about a certain time period in the past, we also reveal who we are now. In ''The '70s House," a takeoff on PBS's time-travel reality series, MTV portrays the 1970s as an era grounded in home design (shags!), fashion (polyester!), products (Gee Your Hair Smells Terrific!), and lingo (groovy!). And that probably says more about the style-and-marketing obsessed TV channel than it does about the 1970s.
But then we each have our own image of the years that stretched out of the 1960s. Some of us picture it as the moment when American culture got healthy and took a jog; others see it as the slow, ugly death of idealism. ''The '70s House," which premieres tomorrow night at 10:30, would have been a lot more engaging if MTV had pitched it at a deeper level involving the social mores and taboos of the time. As its 12 young reality contestants try to live as the country did in the 1970s, the show gets too caught up in the silliness of surfaces, dealing with issues no bigger than wearing short shorts, riding in bulky station wagons, and employing phrases such as ''Shake your booty."