Modular earring holder

My girlfriend sells fantasy jewelry and I like to help her out by designing different sorts of holders and displays for accessories. She told me the displays I designed for her didn't work for all the sort of earrings she has, So I went back to the drawing board and came up with this solution. When the earrings get sold, you take off a module to have less empty space. The modules can be installed horizontally or vertically to optimize space. The holes go through to the back, but the pegs might interfere in some of them, so keep that in mind. I guess this could be useful for other things, but none come to mind at the moment.