https://wccftech.com/apple-ipod-touch-3-prototype-rear-centered-camera-gallery/

Despite the fact that the iPod touch 3 is several years old, a leaked gallery shows that Apple may have had a different plan as far as the product’s design is concerned. The gallery was shared by Giulio Zompetti, a developer who collects Apple prototypes. Perhaps the biggest change spotted on the iPod touch 3 prototype is the existence of a center rear camera. That is correct, if this iPod touch 3 prototype had gone into production, it would have been Apple’s first product to sport a center rear camera.

If you go through the company’s history, no Apple device released thus far sports a center rear camera, and that’s probably because Apple believes that this decision would interfere with its ‘seamless design’ philosophy. It’s worth noting that the iPod touch 3 didn’t come with a rear-facing camera in the final production phase, and AppleInsider reports that there were technical issues that probably led Apple to exclude that addition on the iPod touch 3.