To view this video please enable JavaScript, and consider upgrading to a web browser that supports HTML5 video Movie 1 Tube formation is driven by gel contraction. 24h time-lapse movie in .mp4 format showing that collagen gels contract over time forcing organoids into alignment and close proximity. Intestinal epithelial organoids fuse to form self-organizing tubes in floating collagen gels Norman Sachs, Yoshiyuki Tsukamoto, Pekka Kujala, Peter J. Peters, and Hans Clevers Development 2017. 144:1107-1112; doi: 10.1242/dev.143933 Download Original Video