Between the forelegs of the Sphinx and in front of his chest, is the "Dream" Stela of Thutmose IV (c.1400-1390 B.C.E.). This granite stela dates from the first year of Thutmose’s reign and recounts a dream from his early years in which the Sphinx promised him kingship. In return, Thutmose would clear the sand from around the body of the Sphinx.

In front of the stela is a free-standing altar, a remnant of a chapel placed here during the reign of Ramesses II (c.1279-1213 B.C.E.).

Within this area, the legs of the Sphinx reach out to envelope the visitor, while the majestic head of the Sphinx dominates the space. The effect is quite awesome.

Information provided by: http://www.memphis.edu