Self Referential Hanjie!

Look, I have no idea what this.. "THING".. is, but for some odd reason, this whole hanjie is in the shape of itself. Every 5x5 tile is either an X, or the shape of the big puzzle. The whole 25x25 Hanjie, has itself repeating on the inside. Find out just one of the small ones, and you can fill in the rest. Can you find the stray shape and solve the loop?

Careful - The Xs are on the board too! Just remember; all the filled in 5x5 tiles look the SAME and each other, and the layout of the big board!