Expanded polystyrene blocks are easy to carve but it takes real skill to turn them into a rock grotto like the one shown here
Benchmark Foam: Expanded Polystyrene (EPS) Foam Manufacturer
Bridge Window Block-outs Geofoam, Styrofoam, EPS & Polystyrene
Create Rocks and Caves using EPS Foam
What is Geofoam? Where to Use? - Geobera
EPS Foam used to create realistic Rock Formation
How It is Made Geofoam Blocks EPS Foam Blocks AKA Styrofoam Blocks
EPS Foam were used to sculpt caves & walls
Foam Blocks as Furniture Geofoam, Styrofoam, EPS & Polystyrene
EPS Form for Pool Void Fill Geofoam, Styrofoam, EPS
EPS Foam Solution for Church Stage Project in Brentwood, TN
EPS Foam blocks to create giant rock formation
Projects By Rep Geofoam, Styrofoam, EPS & Polystyrene
What Is Expanded Polystyrene (EPS)? - Geofoam International
GeoFoam – Insulfoam