In terms of that functional void, every lure in my tackle box has a purpose. For example, my hard topwater box includes popping baits, walking baits, and prop baits. Before buying any more of those lures, I take a detailed inventory of the box and make a mental checklist that spans everything from quantity to construction. Do I have enough prop baits? If so, do I have all the right sizes for fishing where I plan to fish? I look at each lure and make sure it has premium hooks. Then I look at overall quality of construction and decide whether or not the models or brands that I have are going to do the best possible job at my next fishing location. If I do decide to pick up new lures to fill a void, the lowest priority for the purchase, believe it or not, is color. Too many buyers prioritize color too highly, and that's why you'll see a red sports car with a bad oil leak parked at Johnny's Used Car Lot. It sure looks sexy, but it's a functional nightmare.