  We introduce the Hilbert-Galton board as a variant of the classical Galton
board. Balls fall into a row of bins at a rate depending on the bin, and at
random times, each bin gets shifted one unit to the right and an empty bin is
added to the left. We compute the stationary distribution of this Markov chain
and show the existence of an enriched Markov chain on triangular arrays of
numbers which projects down to the Hilbert-Galton board. We also define
finite-ball projections of the Hilbert-Galton board, for which we compute the
stationary distribution, the full spectrum and the grand coupling time.
