An automated brick laying system for constructing a building from a plurality of bricks comprises a robot provided with a brick laying and adhesive applying head, a measuring system, and a controller that provides control data to the robot to lay the bricks at predetermined locations. The integrating light pipe is positioned to receive light from a light source at the input face and transmit the light at the output face. A circuit designation strip and row marking pads are provided to designate rows and circuit connections. The payload interface board, the at least one daughter board, and the battery board are coupled to the main system board through one or more stackable connectors. A children’s ride-on vehicle also is disclosed. Also provided are D-arabinitol compounds, methods for preparing such compounds and compositions of such compounds, and methods of using such compounds.