This is great, and you can stare at it forever trying to find a pattern. Sometimes there is one, and then something comes along to disrupt it.
C'mon guys. At least do a little research and source the original creator... plus a higher quality GIF. www.christiantailor.co.uk/?portfolio=marvel-dc-character-loop
That Tumblr is the worst and never credits artists/creators unless they watermark their pictures.