The psychology of store design helps retail designers plan the effective look and feel of a retail store to ensure it stands out from competitors. All four corners of the store must be accurately viewed and assessed. Wall colors, signage, checkout counters, shelving schemes, displays and other areas form part of the store layout. The interior design of a retail store plays a key role in attracting customers and increasing sales. Proper placement of mannequins, shelves and other props can help a store appear more attractive. Creating a theme also helps create an atmosphere that attracts customers.