A ceiling system comprising: an overhead support grid comprising a bottom surface, the overhead support grid defining a grid opening configured for locating a ceiling tile therein; and a ceiling tile positioned in the grid opening and having a top surface and a bottom surface, the ceiling tile having a first tegular edge engaging the support grid and an opposing second tegular edge engaging the support grid, the first tegular edge having a configuration different than the second tegular edge; a third angled tegular edge and an opposing fourth angled tegular edge both disposed at a 90 degree angle on the ceiling tile to the first and second tegular edges (108, 106) the third angled tegular edge defining a downward facing third support surface engaging an upward facing support surface formed on the support grid, and the opposing fourth tegular edge defining a downward facing fourth support surface engaging an upward facing support surface formed on the support grid, characterized in that the third and fourth support surfaces (110a, 112a) are disposed at an angle to the top and bottom surface of the ceiling tile between 0 and 45 degrees; wherein the ceiling tile has a substantially uniform thickness between the first and second tegular edges (108, 106) and the top surface and the bottom surface of the ceiling tile is angled with respect to the support grid when mounted therein and the bottom surface being substantially parallel to the top surface of the ceiling tile; and wherein the bottom surface of the ceiling tile is substantially flush with the bottom surface of the support grid at the second tegular edge. an overhead support grid comprising a bottom surface, the overhead support grid defining a grid opening configured for locating a ceiling tile therein; and a ceiling tile positioned in the grid opening and having a top surface and a bottom surface, the ceiling tile having a first tegular edge engaging the support grid and an opposing second tegular edge engaging the support grid, the first tegular edge having a configuration different than the second tegular edge; a third angled tegular edge and an opposing fourth angled tegular edge both disposed at a 90 degree angle on the ceiling tile to the first and second tegular edges (108, 106) the third angled tegular edge defining a downward facing third support surface engaging an upward facing support surface formed on the support grid, and the opposing fourth tegular edge defining a downward facing fourth support surface engaging an upward facing support surface formed on the support grid, characterized in that the third and fourth support surfaces (110a, 112a) are disposed at an angle to the top and bottom surface of the ceiling tile between 0 and 45 degrees; wherein the ceiling tile has a substantially uniform thickness between the first and second tegular edges (108, 106) and the top surface and the bottom surface of the ceiling tile is angled with respect to the support grid when mounted therein and the bottom surface being substantially parallel to the top surface of the ceiling tile; and wherein the bottom surface of the ceiling tile is substantially flush with the bottom surface of the support grid at the second tegular edge.