Material Design Search Header

I think that headers make for great search bars. Rather than opening a search panel and taking up room in the screen with a search input where content would aggregate, why not use the header as the search bar?

I did this for my A.V. Club project earlier in the year. I've posted a video of it before but haven't posted an up-close view of the element itself.

I designed it in Sketch and prototyped it in Pixate. This is a real, working interaction!