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Code for the digital rain custom visual adapted from https://medium.freecodecamp.com/canmaking-it-rain-code-matrix-style-ec6e1386084e#.qvt48wdeu
In answer to a question asked elsewhere, this uses three custom visuals:
I've loaded the PBIX. It's pretty basic with the Play Axis controlling a sequence that the Cards With States displays once you "choose the red pill".