Ultraviolet blacklight as the main light: an indoor glow-in-the-dark mini golf course in a dark room, the only light coming from UV tubes so that everything fluorescent glows by itself — neon-painted obstacles, a little windmill and bridge painted in glowing pink, green and yellow stripes, white golf balls shining bright blue-white, the putter grips glowing. Anything not fluorescent stays deep violet-black. Saturated electric colors on black, playful arcade mood, no people. No text, no letters, no logos.