- Create a wedge.
- Duplicate the wedge and rotate it.
- Create a cube, place it between the wedges.
- Join the 3 objects (Tools -> Join).
- Go to Edit Mode (Tab). Select edge on the base of the object and move the 3D cursor to it (Shift + S -> Cursor to Selected).
- Go back to Object Mode (Tab) and select Object -> Transform -> Origin to 3D Cursor.
- From the Properties set Location to 0, 0, 0 on x, y, z.
- Enjoy your periscope with base at 0, 0, 0.
