“Here’s an explanation of our adobe T-brick building method. It’s simple, easy, and can be done by just about anyone: https://naturalbuildingblog.com/cast-in-situ-adobe-t-bricks
The concept is simple. You make a T-form with scrap lumber or metal, and you pour the adobe bricks right in place on the wall. The form only needs to be on the brick for about 5 minutes, then you pull it off, and move down the wall. If you set it up correctly, the forms walk down a wall like a caterpillar, with the end form jumping to the start of the line over and over.
Each course shifts half a brick, so that the space from the forms gets filled with the next course, creating an interlocking brick that’s both easy and cheap to make.
We used stabilized adobe, but you could use just about any material for this.”