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The Reverse Infinity is, as it sounds, a time reversed variation of the Infinity. The trick is essentially just Columns with the center ball thrown from the outside such that it will travel between the two vertical balls (when they are thrown again) and be caught in the middle. Given its simplicity I don't think an in-depth tutorial for this pattern is really necessary—just juggle Columns and try making the special throw with the center ball. Start with just one or two every so often and then gradually work until you are doing the Reverse Infinity continuously.