Nice subtle load transitions in this One Pager for Madrid-based market research agency, Seim. Overall the design feels a bit “stock-photoy” but this navigation is really unique. As you scroll the brand icon spin and the navigation reorders to indicate where you are in the current long page.

This website has unfortunately been redesigned or gone offline, so I have removed the direct link to it. The screenshot below hopefully preserved enough of the design but if you are really keen to inspect further, try this Archive.org link. FYI: the site was first featured on 06 January 2016.