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 mig