Tableau is a solitaire that founds its own style, which means all cards are open and arranged to the left and right of the foundations. This is a similar setup like Little Napoleon Patience (solitaire), Beleaguered Castle, Fortress (solitaire), Kings Solitaire (solitaire), or Fürst Bismarck (solitaire). This is a thinking and planning game that starts hard and gets easier the farther one advances.
Cascades are built down in suit. The foundations are built up from the aces in suit. You can move multiple cards that are descending in suit between cascades.
Rudolf Heinrich, 1976, “Die schönsten Patiencen”. Perlen-Reihe 641, 18th and 27th Edition, probably out of print, ISBN 3-85223-095-0, Perlen-Reihe Verlag, Wien