Mystery on the Mall, Game 3
![week-04.jpg](https://th-thumbnailer.cdn-si-edu.com/AkurO-Ds_cLjQ9ejUq93AmL7Jh0=/1000x750/filters:no_upscale()/https://tf-cmsv2-smithsonianmag-media.s3.amazonaws.com/filer/week-04.jpg)
Ready for another guess-this-picture game? We snapped this mysterious whirligig somewhere Around the Mall at the Smithsonian. Tell us what you think it is.
Is it a propeller on steroids? The world's coolest water slide? A Frank Gehry gone gonzo?
Check back later, when we reveal what it is.
(Photograph by Scott Stark)