It's the gift that keeps on giving.
A new viral 'invisible box challenge' video has taken the internet -- and the Circa office -- by storm. The premise of the challenge is pretty simple and entertaining to watch.
The trick involves stepping onto the "box" with one foot and then hopping over it with the other foot.
When done right performers look like they're momentarily walking on air.
According to the DailyMail, this challenge has been around for years, but after one football player and one cheerleader performed the trick to perfection, it has resurfaced again on social media.
Check out some of the best videos below.