You’ve seen it on celebrities, now try it on yourself: The half-up top knot is the perfectly imperfect hairstyle for summer. Not only is it cute, Rihanna-approved, and seasonally appropriate, but it’s also beyond easy, so even if you don’t know “how to do hair,” you definitely know how to do this. What we’re trying to say is that it’s fundamentally perfect, and that you should try it now. We’d suggest that it be your “weekend project,” but hey, it’s not much of a project at all. Need some inspiration? Start here, then get to it.