Jewish Ceremonial Hall
This is not an optical illusion but it is a house of the former Ceremonial Hall and Mortuary situated at the Old Jewish Cemetery.
Nowadays, this building holds one of permanent exhibitions under the auspices of Jewish Museum relating to the final part of Jewish Customs and Traditions – Lifetime. The Ceremonial Hall of the Prague Burial Society - Hevrah Kaddishah stands nearby Klausen synagogue. It was built in 1911-12 according to the design of a prominent architect František Gerstel.
More info:
http://www.praguecityline.com/monuments/jewish-ceremonial-hall
