Hobbies are healthy. They keep the mind active while providing a sense of accomplishment. Some people garden while others complete crosswords. Others like to build things such as furniture or model airplanes. However, not everyone is satisfied with your typical run-of-the-mill household hobbies. Sometimes, you have to think outside the box. Take the example from Marc W. Zak. 

He decided the build a 1:1 scale of the infamous BMW M10 four-cylinder engine. Instead of searching the internet for a model kit – which there doesn’t appear to be any – he decided to make his own model using corrugated and cardboard paper materials.