The blue brick refers to the "space stone" in the Marvel universe, also known as "a stone in the Rubik's Cube". Yellow brick refers to the "space-time stone" in Marvel universe, and its color is yellow. The blue brick refers to the "space stone" in the Marvel universe, also known as "a stone in the Rubik's Cube". Its color is blue, which first appeared in the movie Thor, and later appeared in The Avengers, The Avengers 2: The Ultron Age, Captain America: Civil War and other movies. The use of blue bricks can control time and space, and has the ability of transmission, deformation and strengthening. Yellow brick refers to the "space-time stone" in Marvel universe, and its color is yellow. The yellow brick first appeared in the movie Doctor Strange, and was widely used in The Avengers 3: Infinite War, Avengers: Endgame and other movies. Using yellow brick can control time, and it has the ability of time to go back and time stop.