Reality Checkpoint, Cast-iron streetlight at Parker's Piece, Cambridge, England

The Reality Checkpoint is a four-sided cast-iron lamppost standing where diagonal paths meet across the Parker's Piece green space. The structure is decorated with four intertwined heraldic dolphins, while scrolled wrought iron stays support four pendant lamps positioned around the post.

A lamp at the centre of Parker's Piece was first proposed in 1890, and the pillar was erected in January 1894 after a pipe was laid from Parkside. It was cast in Glasgow by the Sun Foundry of George Smith & Company and described at the time as a "very handsome ornament to the Piece". In 1945 U.S. soldiers celebrating Victory over Japan tore down the post above the dolphins; George Lister & Sons of Cambridge repaired it in September 1946, when the four pendant lamps were added. It was listed Grade II in 1996 and restored by the city council in 2016–17.

The name emerged in the early 1970s as a playful marker of where the academic world of the university met everyday town life. Locals and students still use this spot as a symbolic crossing point between two different parts of Cambridge.

The lamppost stands at the central meeting point on Parker's Piece and serves as a useful landmark for finding your way across the green space. It is easily reached on foot and located in an open, clearly visible spot that is recognizable in both daylight and after dark.

The post above the dolphins was torn down in 1945 by U.S. soldiers celebrating Victory over Japan Day. A local firm, George Lister & Sons, repaired it in September 1946; foreman Sam Mason worked with apprentice Tony Challis, who made the scrollwork at the top. The four pendant lamps date from that repair.