He had entered an art contest (https://steemit.com/art/@soulturtle/art-explosion-or-city) and his piece looked very Escher-ish.

So steembasicincome will send you an upvote from now on on every post you post. Obviously the more shares you have the more the upvote is. For sure look into it... in a few days you should start seeing an upvote from @SBi (with a number) or something like that! Enjoy