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The diabolo (commonly misspelled as diablo) is a juggling prop consisting of a spool which is whirled and tossed on a string tied to two sticks held one in each hand. A huge variety of tricks are possible using the sticks, string, and various body parts. Multiple diabolos can be spun on a single string.
Diabolos come in different shapes and materials. Large/heavier diabolos tend to retain their momentum for longer, whereas small/light diabolos can be thrown higher and are faster to get spinning quickly. Rubber diabolos are less prone to breakage; metal diabolos can be set on fire using some wick and fuel. A one sided diabolo is also availabe however it is very hard to spin/trick with.
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Diabolos evolved from the Chinese yo-yo. Chinese yo-yos have a long thin axle, with disc-shaped wheels, while the western diabolo is more cone-shaped. For a comparison, see a picture of a diabolo here and a picture of a Chinese yo-yo here.
The diabolo was a favorite toy of physicist James Clerk Maxwell, who was said to be quite good at performing with it. This toy is not to be confused with Maxwell's demon, which is a thought experiment.
The most basic act of diabolo manipulation is to cause the spool to spin whilst suspended from the string. This is commonly achieved by dragging the string across the axle in such a way that the friction causes the spool to roll. By repeatedly lifting one of the handsticks (for right handed people, the driving hand is typically the right), the speed can be increased. This method is known as Snaps.
Further increases in speed are obtained by a variety of techniques including:
Once speed is built up, the diabolist then typically performs a routine based on the tricks outlined below. The best diaboloists can work these tricks smoothly into one another and keep the diabolo in a constant motion without having to pause to speed up the spin again.
There are many tricks which fall outside these categories, these are often more difficult and form the "cutting edge" of diabolo modern routines. Some examples are:
Perhaps the most active area of development for diabolo involves tricks with more than one diabolo on a single string. Diabolists have pushed the number of spools juggled at once up to 6 (although there is some controversy as to whether this counts as the number of catches achieved is so small). Most diabolists however, stick to two or three. The introduction of multiple diabolos on a single string allows for many new moves.
Another advanced diabolo style, that has been developed in the more recent years and particularly explored further in the last few months is Vertax (Vertical Axis) A.K.A Excalibur. This is where the diabolo is 'tipped vertical' by means of 'whipping' and is continually spinned in this upright state. Although the number of tricks seems limited, people are finding more ways to perform with this style, including Vertax genocides, passing and many acrobatic moves. It has also been attempted many times to have two diabolos in the vertax style on the same string, although video evidence of this feat is yet to be seen.