Strips of LED lights designed to look like laser beams mark the pathways inside this clinic in Serbia, recently completed by local firm Fluid:Architecture ( slideshow). Upon entering, patients find themselves in a small reception room with a glowing counter. A 15-metre-long corridor with shiny white walls leads to the waiting room. In an attempt to make a trip to the clinic more exciting, the architects concealed treatment rooms behind a series of hidden doors along the corridor.