A church's composition, history, or philosophy of ministry can erect a wall newcomers have a difficult time scaling.

When the authorities erected a wall of moss alongside the city's busiest road, in the hope it would absorb toxic particles, it turned grey-brown.

Interior scaffolds used in erecting the walls probably rested on those cornerstones, in which corbels were made for the purpose.

An early proposal would have erected a wall between the workshop where exhibits were being developed and the main visitor areas.