The straight curtain rod will need a shower or bathtub that is design in three-wall space only, even if it can be install in regular space, it will spend a lot of space that can be useful for other things, so it is not efficient. Your bathtub will look more elegant and classy if you decorate it with curtain rod. There are several types of curtain rod; there are ones that are plainly straight, there are ones that has L shape. This L shaped curtain rod is very famous because it is good to be installed in a small or even spacious bathroom. Architecture.