View of the ruined gatehouse and part of the curtain wall of Nether Hall in Essex. Nether Hall is an early Tudor Manor House. The entrance is flanked by two polygonal towers which are three stories high. It is built of brick with blue brick diaper (an all over surface decoration of a small repeated pattern) work and decorated with trefoiled corbel friezes. During the 15th and early 16th century, it was fashionable to have a huge fortified gatehouse entrance, and grander examples of these can be found in Hampton Court Palace and several Cambridge colleges.