To demold your original, cut the plastic mold wall and remove it completely. Lift the entire mold to separate it from the base. You will need to cut open your mold in 4 places in order to demold your original piece. It is helpful to have a friend help hold the mold open while cutting. Continue cutting just enough so that you can demold your piece. Do not cut your mold all the way to the bottom.
The original sea anemone has been successfully demolded and is ready for casting. All the detail has been captured by the mold rubber.