The janitor at the MuMaLab is a real nice guy. He's helping us all the time. So when he asked me for two shields to put in front of his parking lot, I put some effort into it.
It's lasered into yellow acrylic and mounted with some spacers over an aluminium plate. The acrylic glows when illuminated by UV light, looks awesome in sunshine. At night the aluminium reflects the headlights.