Duchampian Sliding Screens Salesman Sample (or Moire Pattern Making Machine) early printing block which are quite precious

which are quite precious

I presume is a signature of sorts--appearing also in other) but it has lead me nowhere

but these are the first that I've found

10 1/4" x 8"

Duchampian Sliding Screens Salesman Sample (or Moire Pattern Making Machine) early printing block which are quite preciousAnother example of a thing made for one purpose, but which, recontextualized, feels quite like an artwork, this one feeling very Duchampian to me, including for his ongoing interest in thresholds and portals (doors, windows, peepholes, glass, etc..) I believe it was made as a salesman sample for sliding screens, here with three screens, each with handles for sliding them in one direction or the other. They can all be slid, one by one, to one side or