- Photography All Transformers Uranus October 6, 2014September 17, 2015 Fansproject Function X-4 Sigma L Posted By: Flap Jack Headmasters, MIndwipe Thanks to Uranus Secret Toys Garden on Weibo, here are some pics of Fansproject Function X-4 Sigma L.. Liked it? Take a second to support TF-Prototype on Patreon!Share:Click to share on Facebook (Opens in new window)Click to share on Twitter (Opens in new window)Click to share on Reddit (Opens in new window)Click to share on Tumblr (Opens in new window)