80's tv show sets

A couple nights ago I was sitting around the house and something made the pilot of the Cosby Show jump into my head. Most people would remember this episode as the one where Cliff gives Theo his big talk about getting good grades to get a good job to make enough money to live using monopoly money, or even for the fact that as far as anyone knew the oldest daughter, Sandra, didn't exist. I personally remember it more for the fact that it was filmed on a completely different set than the rest of the series. Very interesting no? Well, to me that was just the tip of the iceberg. While thinking about this I noticed some similarities in my head to a lot of other sets of TV shows through the years. This would be the front door is to the right of the screen, with a step inside and immediately to your right as you walk in the door there is a set of stairs that has a small landing a few steps up and then a turn to the left and up to the "second floor". of course right in front of the room is the couch and behind that is not only the set of stairs, but to the left of that there is usually a room that goes back (sitting room, dining room) something along those lines. I can think of NUMEROUS shows from the area that basically filmed on the exact same set.. see if you can think of anymore... (I apologize for not having any pictures.. after a lengthy search I have not yet been able to find any of just a set from any of these shows.) Anyway, the list includes The Cosby show pilot, Blossom, Roc, Amen, Hangin with Mr Cooper, Gimme a Break, I think Sister Sister (I never really watched it so I can't remember for sure), whatever that show was with LL Cool J in it... anyway, there are a TON from that time period of like 1983-1993... This was common in the 50's and 60's, just look at shows like Mr Ed and how similar the set looks to something like my 3 son. They have a set that is based on these from the 50's-60'sthat they also commonly use on saturday night live (and used on Clarissa Explain it All as well...), anyway, that's beside the point.. Did all these production companies and networks not think that we would notice that they were basically recycling the same set over and over again??? Upon further contemplation the sets for Who's the Boss is eerily similar to that of Growing Pains.. This bothers me... did they really think we wouldn't notice?? oh sure there are minor changes, but the set is the same... did they just buy them prefabricated from the same set making company?? Is there a company that only builds sets to look like houses for television family sitcoms? These are all questions that should be answered one day.. I do feel that a portion of my innocence has died with this realization. I'm sorry to have ruined the illusion for everyone else...