Space-time square spiral

3D Model

Space-time square spiral, made with Open SCAD, dervide from a simle LibreLogo script: TO SPIRAL IL EL DS A IF IL < EL [ STOP ] FORWARD IL LEFT A SPIRAL IL–DS EL DS A END SPIRAL 50 5 0.5 89

where

IL: initial lenght EL: ending leght DS: decreasing step A: turning angle