Borer - Arranging Chairs

The following question was sent by one of the Chabura to Rav Ostroff:

If I have two cups on table, my understanding is I can only take the one I want (l'alter). What about arranging chairs? And what if they're stacked?

Rav Ostroff replied:

But it's one min and they're the same, I don't see a mixture. It's like having 10 identical socks in a drawer - there is no mixture.