Fire can be used as a tool, too; it can help us to make a job. Or at least, we can use it to make this job easier. As an example, i´d like to show you this pics in which you can see how using coals in some pieces of wood to make a mortar or a bowl. Without the help of fire,and with no modern tools, this job would have been quite hard
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Usando barro para controlar las zonas donde no queremos que el fuego actue
Mud can be used to avoid the coals to get to close to the border
Una vez que hemos obtenido lo que queríamos usando el fuego, podemos proceder a terminar. Usando una piedra rota podemos deshacernos de la parte quemada, como con esta otra pieza de madera, destinada a ser un mortero...
Once we get what we wanted using fire, we can finish the job. Just using a broken stone to get rid of the burned parts, like is shown in next picture with this other piece of wood, wich eventually will became a mortar
Con arena y un canto rodado, lijamos el interior
Using sand and a cobble to "polish" the interior
para obtener un mortero
to get, then, a mortar
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