Collaborating with Mia Tsiamis of TU Delft, CORE studio designed, engineered, fabricated and installed a temporary pavilion for the 2015 International Association for Shell and Spatial Structures (IASS) Symposium. The pavilion, entitled Geometrid (a type of moth that originates as an inch worm), is an 8 meter long kinetic structure that “pulses” through a programmed sequence radically changing in diameter through the expansion and contraction of 8 scissor rings spaced along the central truss. Conforming to symposium constraints of delivering the pavilion to site in no more than six 1m x .75m x .6m boxes with an installed weight not to exceed 192kg, the design was based around 1m long modules. In order to remain within the weight limits, aluminum pipes and waterjet cut expanded PVC board were the primary structural materials, providing a rigid lightweight structure to support the kinetic components. The kinetic assembly consisting of: stepper motors, precision steel rods, ACME threaded rods, and an array of custom 3D printed and CNC cut parts actuates each of the scissor rings. A tensile skin of coated fiberglass mesh was used to provide lateral stability between rings while accentuating the transformation of the pavilion’s overall form. The design was realized through Grasshopper for studying geometric proportions and relationships, Digital Project for fabrication modeling, clash detection, and assembly logic, and Processing, Arduino, and Gcode for motion programming and control.