Visualization of how different sorting algorithms work

I have seen a few Web sites that show these kind of visu­al­iza­tions, but I par­tic­u­larly like this one because you can choose dif­fer­ent ini­tial con­di­tions. The option allows you to see that some sort­ing algo­rithms are faster with cer­tain ini­tial con­di­tions than the others.

Here is the link to the site.