 Jewish themes and symbols also sometimes made appearances in his Prounen , usually with Lissitzky using Hebrew letters as part of the typography or visual code . For the cover of the 1922 book Arba 'ah Teyashim ( Four Billy Goats ; cover ) , he shows an arrangement of Hebrew letters as architectural elements in a dynamic design that mirrors his contemporary Proun typography . This theme was extended into his illustrations for the Shifs @-@ Karta ( Passenger Ticket ) book . 
