The round table is for positions. The square is not. It's for bringing out aggression/defense, or teaching turn on/turn off.
Tables, and particularly the square table, are probably used incorrectly more often than not. In extremely cautious with whom I do table work with
Hunter, USA trial helper, Charleston Working Dog Club Training Helper/Training Director
Beschützer des Jägers v. Sportwaffen, HOT, IPO1, AD, CGC
Katya v. Hügelblick, HOT, IPO2, CGC
SG Aska v. Ketscher Wald, 2 x SchH3, Kkl 1