Do you ever think about how some traditions start?

Like decorating with Tinsel. Tinsel originated in Germany in the early 1600s and back then it was shredded silver. Real silver! 

Tinsel makers of the day would hammer the silver until it was thin, then cut it into strips. Eventually people realised the smoke from Christmas candles caused the tinsel to turn black, so later versions were made with tin and lead. That version proved to be too heavy for a Christmas tree, so the Brits took over and came up with the light silver sparkly tinsel we enjoy today. 

According to Wikipedia during the 1950s, tinsel and tinsel garlands were so popular that they frequently were used more than Christmas lights, as tinsel was much less of a fire hazard! 

Remember the popular aluminium Christmas tress that were made from highly flammable aluminised paper?  

Check out this Red Tinsel Disco Ball!