According to an old English proverb, “necessity is the mother of invention.” While this may hold true for some products, it’s certainly not always the case. Did anyone really need a pet rock? What about a slap bracelet, or a blanket with sleeves?

Inventors can create new products that work just a little bit better than an existing one on the market, while others are simply cool gadgets we’d like to have. Some inventions make our lives simpler and save us a few steps in the kitchen, while others prevent us from having to get off the couch.

Their innovation and contribution to the smart home products we have today.

As time goes by, more and more people are trying their hand at invention and entrepreneurship. From 1965 to 1995, the number of annual patent applications more than doubled. Then, from 1995 to 2015, the number of applications almost tripled.

With all of the portable communication devices, smart home products, and peripheral devices, a whole new window of opportunity exists for entrepreneurs, some of whom are successful. The rest … not so much.

We’ve compiled a list of early smart home tech that didn’t make the cut. Some of these products had conceptual flaws, some were ahead of their time, and others didn’t serve a meaningful purpose. While these smart home technologies seem cool, for one reason or another, they still failed.

Each of these inventions helped to pave the way for other successful products. Premier cigarettes didn’t work out, but society is now beginning to see vaping as a viable smoking cessation method. Sure, no one wanted to buy a product called “iSmell,” but more and more VR products have flooded the market in the time since. The world may not have been ready for NCR’s Microwave Bank, but we now have a variety of Wi-Fi-connected appliances to choose from.

So yes, these products did fail. But we should give them some credit for their innovation and contribution to the smart home products we have today.