Donahue, Bill (2004). "The Mathematics of...Juggling", DiscoverMagazine.com. Depicts even and odd numbers increasing in height by one unit.
Tiemann, Bruce and Magnusson, Bengt (1991). "A Notation for Juggling Tricks", Juggler's Workshop. Depicts even and odd numbers as equal in height (1=2 (implied), 3=4, 5=6, ...) and increasing by one unit.
This media depicts a juggling pattern using one or more of standardized juggling notations (such as juggling ladder). Juggling pattern notation may be created identically for each juggling pattern (no "distinctiveness"), which consist of common knowledge ("common material"), and may be performed by anyone with the necessary skill. As such, ladder notation, which is considered too simple to be eligible for copyright protection, or which consists only of a system, with no original creative input.
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