Mechanical Engagement Ring Box
So the story on epbot.com goes like this;






1. On the outside, Reddit user&nbsp;curtisabrina&amp;#8217;s creation appears to be a simple jewelry box:









2. Open the lid, and you&amp;#8217;ll find a typical - albeit lovely - jewelry tray:





3. Those two brass heart keys fit together to form a single key, which Curtis gave to his sweetie a full&nbsp;seven monthsbefore giving her this jewelry box to propose. (Talk about a long-term planner!)
Now, the&nbsp;real&nbsp;magic starts when you lift up the jewelry tray.&nbsp;
Hidden underneath:





4. GREAT GRINDING GEARS, BATMAN!
Curtis designed and machined every piece of this himself, by the way, estimating he spent over&nbsp;200 hours&nbsp;on the box&amp;#8217;s creation.
So, where&amp;#8217;s the actual engagement ring box? Well, insert the double heart key:





5. Give it a twist, and the iris on the left opens&amp;#8230;
&amp;#8230;revealing yet&nbsp;another&nbsp;custom box with a heart insert and laser engraving.&nbsp;
Oh, and the engagement ring. ;)
Simply&nbsp;amazing.




More pics at Curtis&amp;#8217;&nbsp;Imgur gallery.