adjective – someone or something that is invisible cannot be seen
The house was invisible from the road.
"Good design when it is done well becomes invisible. It is only when it is done poorly that we notice it."
Regarding invisibility in design approach, typefaces might be appropriate example of invisible design works and Futura is one of the most invisible (!) fonts, despite being in everywhere. Let's check on its story and invisibility in design.
The Power of Simplification - Tony Fadell
Sabon LT Roman is available on My Fonts.