In sunshine as vivid as revelation, Linden Avery knelt on the stone of a low-walled coign like a balcony high in the outward face of Revelstone's watchtower.
{i} keystone of an arch; external corner or angle of a wall; cornerstone, stone forming the external angle of a wall
expandable metal or wooden wedge used by printers to lock up a form within a chase
spelling of Coin, Quoin, a corner, wedge; chiefly used in the phrase coign of vantage, a position advantageous for action or observation