4TU.BOUW Lighthouse projects + PDEng Four Dutch Universities of Technology decided to collaborate as 4TU.Bouw Center of Excellence for the Built Environment. This issue of SPOOL is dedicated to the last batch of 4TU.BOUW Lighthouse projects . ‘Lighthouse projects’ aim at promoting and starting up imaginative research projects, delivering tangible results like demo's, mock-ups, prototypes, test runs, lab environments and so on. 10 projects / 56 pages E-ISSN 2215-0900 Issue editors Ir. Siebe Bakker, bureaubakker Delft Dr.ir. F.D. van der Hoeven, TU Delft

EXCASAFEZONE...17-20 GEOCON BRIDGE...21-26 Happy Senior Living...27-32 Re-Printing Architectural Heritage...33-36 Re^3 Glass...37-40 4TU.Bouw Lighthouse projects + PDEng...3-4 Terra–Ink...41-46 3D Concrete Printing for Structural Applications...5-10 Air Curtain Optimization...47-50 Adaptive Variable Stiffness with strategically arranged materials...11-16 Sustainable Performance Optimization for Digital Housing...51-54