Thanks for the info on the plaster sculpture "eggs". This is similiar to a
project taught in 3-D design classes at Calif State U. Long Beach art dept.
Another variation is to use different balloon shapes and drape the filled
balloons over rolls or sheets of rubber foam while the plaster sets. Students
then use these pre-forms as a mass from which to carve a 3-D sculpture with
an emphasis on opening up negative space. This is a nice variation on an
older method of casting a block of plaster in an ice cream tub. Thanks for
reminding me of this project!