title: Creating barplot as showed in the image
body: <p>I'm new to ggplot2, creating basic things using barplot and geom command lines is fine to me but how I can get the shape of small squares representing each case of daily infection like in this picture?</p>
  
  <p><a href="https://i.stack.imgur.com/YEDaP.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/YEDaP.png" alt="enter image description here"></a></p>