So while not as obvious as in the prior video, it seems the table the 32 metronomes are on allows for enough movement to let this process take effect and lead to them synching with one another. I've said it before and I'll say it again: isn't science cool! If you'd like to check out more videos from IkeguchiLab (many in a similar vein to this one), you can visit their YouTube page by clicking here.
Here you go: metronomes (or "pendula") when on table, oscillate with random phases, since that is how they started and they are "uncoupled" (no energy/information flows from one to other so they do not "know" each other.) When they are all together on the cans, notice that the cans themselves oscillate little, providing coupling/information crossover. which forces "synchronization" in periodic systems (discovered by Huygens in 17th century).