Breezeblocks, via ritahello.
In the 1960s, Eduardo Joselevich and Fanny Fingerman developed a technique to represent images with only four symbols. Full blocks or circles, in either black or white. They called it Fototrama and it was used at Olivetti and Philips for example.
Book cover design by Walter Breker, 1960. Unusual style compared to other text graphics at the time, somewhere inbetween typewriter art and typography perhaps.
Walter Breker, cover artwork for the book Reisebericht. Aluminium in der Architektur der USA, 1960. Düsseldorf, Aluminium-Verlag. Via Shuij Fukuda / pinterest