Each new post appears in the Rastral feed. A feed reader, such as NetNewsWire, Reeder or Feedly, checks it for you and shows you what’s new. To subscribe, copy this address into your reader:
https://sintraworks.github.io/feed/rastral.xml
The feed has only the Rastral posts, not the programming ones on the rest of this blog. If you’d like to see what a reader gets, here is the feed itself, which your browser shows as plain XML.