Rectangular ggplot2 geom_point shape
<p>I came across <a href="https://stackoverflow.com/questions/8112208/how-can-i-obtain-an-unbalanced-grid-of-ggplots">this question</a> which had a really cool graph . I am interested in the graphs on the left with the rectangular points across time.</p>

<p>These rectangular points are not part of R's default set of points to give the geom_point() command. While I can reproduce the graph (or at least one very similar) I don't know how to get the points to look like that.</p>

<p>How can I achieve this? </p>

<p><a href="https://i.stack.imgur.com/ECZdb.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/ECZdb.png" alt="enter image description here"></a></p>