This Guy's Amazingly Complex Marble Runs Have Gone Unexpectedly Viral
Jelle Bakker describes the complex courses as a "hobby".
On Sunday, a video of coloured balls racing through a sand course was shared by numerous Facebook pages and quickly gained millions of views.
Bakker has been running the account for 10 years, updating it regularly with amazing videos of marble runs and ball courses he has built himself.
He has made sand courses, sky rails, and hosted a marble world cup.
Bakker, who says he has a form of autism, told BuzzFeed News that he enjoys making the structures as he finds the look and sound of marbles rolling "soothing".
"My biggest dream is to set up my own museum to show my works," he said. "Another dream is to make a very large, record breaking marble run."
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