Mills' Mess objects, the pattern is adaptable to rings, clubs, torches and a variety of other juggling props. Four-, five-, and (recently) six- and seven-ball variations of these patterns have also been performed, as well as four, five and six clubs. Rubenstein's Revenge is a heavily embellished and distorted Mills Mess. It is one of the most famous Mills Mess variations. The Boston Mess is a variant of Mills Mess in which the arms similarly cross and uncross, but the balls are thrown in columns. It is performed with three balls in a columnar cascade pattern (siteswap 3). Cherry Picking is a
Constant k filter that. The design techniques used by Campbell have largely been superseded. However, the ladder topology used by Campbell with the constant k is still in use today with implementations of modern filter designs such as the Tchebyscheff filter. Campbell gave constant k designs for low-pass, high-pass and band-pass filters. Band-stop and multiple band filters are also possible. Some of the impedance terms and section terms used in this article are pictured in the diagram below. Image theory defines quantities in terms of an infinite cascade of two-port sections, and in the case of the filters being discussed, an infinite ladder