You can judge which are which yourselves:
The teacher spins round and round on their chair, to make sure they give equal attention to all students
The teacher lies on the floor to allow free communication by the students with their classmates on the opposite side of the classroom
The teacher sits in the corner of the room with their back to the class, to prompt student questions and/ or learner autonomy
Chairs are arranged along ley lines
Chairs are coated with cacti, rocks, mirrors etc depending on their position in the room to match feng shui rules
One student sits in the middle of a circle of chairs, with everyone else facing away from them so they don’t feel too shy
One student lies face up on the floor and the other students shout questions at them
The teacher stands on a floor to represent the past, stands on a chair to represent the present and stands on the desk to represent the future, or with their two legs on different levels to represent tenses that bridge two times. (Be careful when demonstrating “was going to”)
The teacher stands behind a student and gives them a massage when it’s their turn to speak
The teacher stands behind a student and moves the student’s arms around to make them use more body language
The teacher sits under the students’ table and whispers things to help them when they get stuck or make big mistakes
The teacher hides under their own desk to show the students it’s time for them to do all the talking
The teacher does a mingle activity that is cleverly designed to leave the smart-arse student on the teacher’s chair in front of everyone
The teacher sticks their chair to their trousers with superglue, so they can walk round and monitor students and speak to them at eye level in proper TEFL style without needing thighs of steel
The teacher cuts three inches off just the front legs on all the students’ chairs, to keep them awake and make their grateful to be able to stand up and do a mingle (rather than furious like usual)
The teacher sabotages three or four chairs to make them wobbly etc, to punish latecomers
The teacher puts their chair on a table, in a desperate attempt to get a bit of respect
The teacher pulls their legs up onto the chair and hugs them while rocking back and forth and humming, to show that their TEFL career really truly is over this time
More on seating plans in TEFL:
TEFLtastic 
Your idea of sitting on different chairs to represent different tenses remided me of a techer I worked with who, to demosntrate some language point that I can’t remember right now (the story was alwys told in the pub after a number of beers) tried to jump up on the desk in front of him.
Much hilarity ensued when he mistimed his jump, smacked his head on the desk, bled all over the place and had to be taken to hospital for stitches.
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You shouldn’t laugh, but…
That was just a slightly over the top version of what my A Level chemistry teacher did to illustrate electron energy levels, but despite obviously completely addled by sniffing bunsen burners he never stumbled once.
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Not really a tenses story but when I did my CELTA my CELTA tutor told me about a final assessed lesson she once saw which involved a warmer where the students had to try to guess idioms from the teacher’s mimed actions.
Only problem was that his first example involved throwing a sheet over a chair, grabbing the back and dry humping it while screaming to the bemused students “WHAT IDIOM IS IT? WHAT AM I DOING?!”.
The idom was “laying a ghost”.. the observers were on the floor crying with laughter and embarrassment after about 60 seconds.
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