Using item-frame reading (in the schematic they may not be placed, see the image in the post) a comparator detects the frequency and emits a redstone pulse. This system is combined twice through an XOR gate that identifies which panel is working and prevents both from working at the same time. The purpose is to select one of 14 categories, reusing the same frequency filter by using two different panels.

Its creation comes from the search for a visual and effective system for choosing categories for a future project.