A couple of videos featuring Lego and K'nex 'ball machines' have gone viral.
The videos spread across the web and generated millions of views between them in a matter of days.
The Clockwork K'nex Ball Machine structure was built by Austin Granger from Saint Paul in the US.
It took eight months to build, has over 40,000 pieces, more than 450 feet of track, 21 different paths, eight motors, five lifts, a one-of-a-kind computer-controlled crane, as well as two computer-controlled illuminated K'nex balls.
You can watch that video here:
The Lego ball machine, meanwhile, was created by designer Akiyuki. It was designed to transport hundreds of small balls across 101ft, at an average rate of one ball per second.
It boasts 17 modules and took two years to complete.
You can watch it in action here:
Want to receive up to the minute toy industry news straight to your inbox? Click here to sign up for the free ToyNews Daily Digest and Newsflash services. You can also follow ToyNews on Twitter and Facebook.