In the HBO series the Senate always met in a circular tier'd room and I have seen this done in other depictions of the Roman senate. Is this accurate for the period or was it perhaps filmed this way to easier capture dialog, etc.? Caesar was murdered in Pompey theatre and I'm not sure of the interior architecture of that building.
The Curia Julia (though it had not been finished at that time) had Senators seated on either side of the building if I remember correctly. I've read it was done this way in the early Republic as well.
Thanks in advance