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Catherine wheel (firework) - The Catherine wheel (also Catharine wheel, pinwheel) is a type of firework consisting of a powder-filled spiral tube, mounted with a pin through its centre. When ignited, it rotates quickly, producing a display of sparks and coloured flame.
Logarithmic spiral - A logarithmic spiral, equiangular spiral or growth spiral is a special kind of spiral curve which often appears in nature. The logarithmic spiral was first described by Descartes and later extensively investigated by Jakob Bernoulli, who called it Spira mirabilis, "the marvelous spiral", and wanted one ...
Wagon-wheel effect - The wagon-wheel effect, sometimes called the waggon-wheel effect, or the stagecoach-wheel effect, is an optical illusion in which a spoked wheel appears to rotate differently from its true rotation. The wheel can appear to rotate more slowly than the true rotation, it can appear stationary, or it ...
Wheel Of Fortune (Gaming) - Wheel Of Fortune or Big Wheel is a casino gambling game where bets are placed on the outcome of the spin of a large circular wheel. The payout is determined on which segment of the wheel lands on a central peg after the wheel has been spun.
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