So far, it unfortunately only exists as a design concept. The “Transparent Glass Toaster” from the Inventables Concept Studio offers complete toast control. Often, what previously emerged from the darkness had a surprisingly black crust. A thing of the past. Now you can watch as your toast goes brown and stop it getting too dark. Apparently made possible by transparent heated glass technology. Great idea, but it might be good to have space for more than one piece of toast.