Wichhäuschen
A weighting house is an extension of the sloping roof or curtain wall , which for a sentry created space.
In the Middle Ages it was mainly used for observation and less often for defense . Wichhäuschen can be found on church towers, towers of castles and palaces and on the walls and towers of city fortifications .
In his Parzival , written in 1205, Wolfram von Eschenbach differentiates between wichus and ärker , but without naming the distinguishing features.