N Took the Dice is essentially a reworking of Eden and After made possible by the roll of a dice (scenes from the 1970 film were combined with outtakes and additional footage in an aleatory way). Robbe-Grillet was always interested in music and since he perceived Eden and After to be serial in nature, it only made sense that its sister film would stand in opposition to that.
In a French seaside town, at a boarding house for civil servants recovering from surgery and maladies, the six male residents' lives change dramatically when two women arrive: Catherine, lively, sexually liberated, willing to kiss, dance, and sleep with the men, and Leonie, reserved, formal, conservative.
The film by Brakhage commonly referred to as "Wecht" does indeed exist. It doesn't have a titlecard at the head, and the leader of the original is labeled "Portrait" in Stan's handwriting, so I'm not sure where the 'Wecht' title comes from.