I.... I'm good at pen / eraser balancing! ♡

They're beautiful to look at, but it needs to be noted that rock stacking is banned in most if not all national parks worldwide due to its negative environmental impact, and that volunteers in those parks have to break up hundreds of cairns because rock stacking is becoming a popular social media trend. (In Australia, disturbing wildlife habitat also carries a penalty of over $8000.) This isn't something that should be encouraged. He's not 'leaving no trace behind': if he has moved a rock that covered a burrow, for example, then the damage to the ecosystem has been done before he starts stacking. https://www.google.com/amp/s/amp.abc.net.au/article/11868706