Hi, I was watching a tv show and I found an optical phenomenon that puzzled me. I´d say it´s related with the bokeh produced in the out of focus range, but I still can´t figure it out. I guess what makes it so weird is that the effect happens in relation with an object in the foreground (infront of the glass, instead of behind it). Since it´s obviously an effect of that glass (as caputred with that lens), I´d say that there´s something particular in the way in wich the rays are beign deflected after they go trhough it´s rectangular cells. Still it´s almost as if they´d move in a curved trayectory. Well, anyway, I was hoping some of you may have a proper explanation, it surley is an interesting physics puzzle.