Piacitelli, Gherardo2009-01-222011-09-072009-01-222011-09-072009-01-22https://openscience.sissa.it/handle/1963/3451In this letter we wish to clarify in which sense the tensor nature of the commutation relations [x^mu,x^nu]=i theta ^{mu nu} underlying Minkowski spacetime quantisation cannot be suppressed even in the twisted approach to Lorentz covariance. We then address the vexata quaestio "why theta"?135129 bytesapplication/pdfen-USPreprint