Akiyuki is a Japanese LEGO master who makes all kinds of impressive contraptions out of the blocks and in this video, they broke down how they made a clock out of LEGO using a mangle rack system.

Akiyuki constructed the clock so the clock circles every 60 seconds and can tell time accurately.

Watch the video above to see how they pulled it off.

And check out their website and their YouTube channel to see more work!