75 NEW LEGO Black 1x1 2/3 Roof Tiles (54200/4504382) cheese slope wedge $1.69 - PicClick
Wait, There's Such A Thing As Illegal LEGO Building Techniques? - SolidSmack
New joining technique? Inverting studs with cheese slopes - General LEGO Discussion - Eurobricks Forums
BrickLink - Part 31110pb109 : LEGO Duplo, Brick 2 x 2 x 2 with Wedge of Cheese on Plate Pattern [Duplo, Brick, Decorated] - BrickLink Reference Catalog