The meccano storage rack has a special position that can turn a brick, to show another side of it. This is a fully mechanical  system, it is controlled by movements of the forklift truck.

The turning mechanism is here (in the blue rectangle): 

At the backside are the two control levers indicated by blue arrows (next picture). 

• The upper arrow shows the lever that is pressed down by the lift, directly after the block is placed. This will turn the block. The lift will now move upward again to get the turned brick and move it to its destination.
• When the forklift turns sideways, it operates the second lever, that will reset the turning mechanism to its original position.

And now I will show the operation of the mechanism. I place and remove the brick by hand here.

In the next video, the lift is operated by hand, and it shows how the brick is turned and then moved again to the highest row.