the ceiling tile with no keels.(there are keels inside it but you can't see them cuz they're hidden),so how do you call this kind of ceilig tile?
Sorry Yangyang, but I don't understand the meaning of keels in the ceiling tiles. There is a style of ceiling called a dropped ceiling where a metal grid framework (often white) hangs lower than the original ceiling and square, often white tiles are placed inside the grid. If any wires or repairs need to be done above the dropped ceiling they can just push up on a tile, do the repairs and then drop the tile back into place. It is seen often in office or industrial spaces and occasionally in residential. It is fairly modern. An older style of ceiling treatment know as a tin ceiling tiles are an antique metal patterned and textured tile that are attached directly onto the ceiling. They are found in old and often expensive homes and sometimes restaurants. Although they are an antique (starting in the 1800s) you can still buy plastic or metal ones to add to a home giving it an old style charm. Are either of these what you are looking for?
