carving with a #11 Exacto blade with a bit of sanding between tool uses. The age of 18 being a limit for this may be a bit high, but I would hate for a little kid to try to copy these somewhat hazardous techniques. There is also a razer saw on the bench, although he does not use it, it is suggestive, too. So, since adults can sign in (and older kids can probably work around the sign up with their parents' accounts, but YouTube is covering their bases) I think in this particular case the block may be warranted. Just my two cents for this particular YouTube example.