Thread:Daddyoh-24/@comment-14657639-20130808114930/@comment-13583182-20130808133531

Because the block size is 7/8, as you walk onto the block of Soul Sand, it gives the effect that you 'sink' into the block slightly since your elevation is slightly lower. Combine this with the fact that movement is slowed while on a block of Soul Sand, the 'sinking' effect is enchanced.