There's just something about secret compartments, am I right? That little "A-ha!" moment of surprise - and combine that a dash of geekery and a dollop of romance, and, WELL.
Which brings me to the most amazing, labor-intensive, and gear-filled ring box yet.
On the outside, Reddit user curtisabrina's creation appears to be a simple jewelry box:
Open the lid, and you'll find a typical - albeit lovely - jewelry tray:
Those two brass heart keys fit together to form a single key, which Curtis gave to his sweetie a full seven months before giving her this jewelry box to propose. (Talk about a long-term planner!)
Now, the real magic starts when you lift up the jewelry tray.
GREAT GRINDING GEARS, BATMAN!
Curtis designed and machined every piece of this himself, by the way, estimating he spent over 200 hours on the box's creation.
So, where's the actual engagement ring box? Well, insert the double heart key:
Give it a twist, and the iris on the left opens...
...revealing yet another custom box with a heart insert and laser engraving.
Oh, and the engagement ring. ;)
There are lots more pics and details over on Curtis' Imgur gallery, including one more custom box he built to house the heart keys, so definitely go check those out!