Although many floor layers regard tiles as being easier to lay than sheet, the layout of the tiles can be critical to the success of the installation. The regular form of tiles, especially when laid in contrasting colours, can accentuate deviations in the building line, emphasising the need for detail planning of the layout. Many floor layers start in the main doorway, believing that the initial impression when entering a room is most important. however, working from the centre of the room and loose laying tiles to check the layout will make the final appearance correct from any viewpoint. This is especially important where a geometric design is incorporated into the floor.