https://www.youtube.com/watch?v=xQLb_uwWzj8 Sometimes, laziness could be a mother of invention. The self lacing shoes is an example for it. As predicted in the movie Back to the future Nike had come up with a product which has an automatic lace which tightens itself after the person wears it. It also has some buttons for the same just in case it doesnt seem to fit right. The sensor senses the persons weight and has a motor which tightens the lace. Check out the video for just a look of the self lacing shoes made to resemble the ones in the movie that was shot decades back. The real design is just slightly different.