So, imagine that Tefillin Barbie has children one day. (She'd have some anatomical problems, but hey, I hear they can do some wonderful things with fertility treatment these days.) And then imagine that those children want to play with teeny-tiny meta-dolls of their own. Would you believe that someone out there has already hand-knitted teeny-tiny clothes for the teeny-tiny meta-dolls? Let's not think what it would be like if the baby Barbies wanted their dollies to have little dolly tefillin as well...
Seriously? On the scale she's using the dolls' dolls' dolls would be less than 1 mm tall. I'm thinking you'd have to get one of those gadgets for writing on grains of rice, and just do a simple smily face on a grain. Surely nobody is insane enough to make clothes at 1 : 123 scale!
The original was Jonathan Swift On Poetry -- So, naturalists observe, a flea/Hath smaller fleas that on him prey;/And these have smaller fleas to bite 'em,/And so proceed ad infinitum./Thus every poet, in his kind,/Is bit by him that comes behind. The ditty adopted by Lethargic Man is Augustus de Morgan (1806 -- 1871) A Budget of Paradoxes.
Without a URL I can only sign myself the Southernwood Pedant.
On reflection, I think the difference between where you're coming from and where I am is the fact that I'm basing my thinking on mathematical induction, where there's no stage beyond "one" short of "infinity".
OMG! There's mini-Playmobil for Playmobil kids? That's one of the coolest things I've ever heard, and it makes me want some, even though I don't have any children in my life to play Playmobil with. (I like the way your icon is appropriate for the topic, too.)