Please hit F5, CTRL+R, CMD+R, clean your browser’s cache, turn your computer off and then back on again, … 
What I wanted to say: If you refresh this page you should see the new header which is in fact recreated from the old one. 
This is a Retina-ready version based on the Clean-Retina theme. I like the way themes can be customised in WordPress. You just add a folder named “themeXYZ-child”, put a style.css in it referencing the original one and you are good to go.
The menu bar previously had a solid background and was replaced by a semi-transparent image which makes the header less rigid.
Of course I could not resist to add my personal formula to the header. It represents definitely an awesome aim to strive for. 