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There are posts I've already shared where I explain step by step what's happening. Here's the link to the first part. https://steemit.com/life/@lily-da-vine/wood-fired-cob-oven-adventures-part-one-what-s-a-cob-oven

Yes. but it looks to me that you poured the sands into the space, so noplace is left for the fire and the cooking.

In the post I explain the sand acts as a mold. Once you cut a hole in the front and empty it out, it becomes hollow again.

OK I got it
Thank you.