Simple one for the day. What is this called?

If you cannot see the animation, click on the image.

Cracked by: duriel , Raghuvansh , shenoyvarun86 , Goyal , nisha’s thambi , Martin , Sharada , Dibyo , username , priyananda , calvin , Vivek , AmK , p vs np , Mo , Ananth , Aparna , udupendra , nisha’s thambi , malcaluffin , SGK , Siddharth Jain , sand and shrik.

duriel, Raghuvansh, shenoyvarun86, Goyal, nisha’s thambi, Martin, Sharada, Dibyo, username, priyananda, calvin, Vivek, AmK, p vs np, Mo, Ananth, Aparna, udupendra, nisha’s thambi, malcaluffin, SGK, Siddharth Jain, sand and shrik