Notice in the picture with the single layers the tiles are numbered.That is basically for visual. You can see 3/4" as well as 3". What you need to do is use colored blocks. with numbers on them. That is where the detail is.
I have no way of knowing where or how you are demonstarting. My point is to identify by color the different places for the pieces is more valuable than size but if you feel larger is better than you are the one doing the demo. Then larger numbers is a must too. You may want to talk about grain direction too. These are my thoughts as you asked for.Notice in the picture with the single layers the tiles are numbered.
I will be demonstrating on a stage in a theater so I think using the larger tiles will be seen better. And yes, for visual demonstration.
Thanks for the comments. Grain direction is a consideration which depends on how the tiles are cut and oriented in the blank.I have no way of knowing where or how you are demonstarting. My point is to identify by color the different places for the pieces is more valuable than size but if you feel larger is better than you are the one doing the demo. Then larger numbers is a must too. You may want to talk about grain direction too. These are my thoughts as you asked for.