Looks like styrofoam base with maybe 1" squares pined and glued into place you fill in from bottom to top. You can use different size squares on you way up the base to allow different look due to size change.
Looks like styrofoam base with maybe 1" squares pined and glued into place you fill in from bottom to top. You can use different size squares on you way up the base to allow different look due to size change.
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