After seeing the effect of water being vibrated as it came out of a hose, Arduino forum member "focalist" decided to create his version using an Arduino, a servo and some simple circuitry. By adding fluorescent colouring to water which is then passed through a tube with the end controlled by a servo, it can be seen at night when a blacklight is shined on the liquid. Then with the Arduino commanding the servo, various effects can be generated, for example:
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