This is a limestone fragment with a squared grid on it.
It is from Egypt but the exact location is unknown. Squared grids were used by Egyptian artists to work out the scale of larger paintings they were about to work on. Grids were then marked onto the walls with string and red paint to get the correct proportions, and the design scaled up on the wall. First a sketch was made, usually with red paint, then corrected in black. The design was then carved out or painted in. The grid lines were usually cut away or covered with paint. This is a limestone fragment with a squared grid on it. It is made from limestone. We do not know how old this object is.