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 Galileo and Square are comparable.  They have the icky outcome in common.  Both Square and Galileo are challenged and are forced to give up their views.  The consequences of telling their new discoveries are bizarre.  However, the motives of telling people their views are a bit different from each other.  Square is a humble professional, and is driven by his own curiosity, whereas Galileo is a selfish scientist who wants to be famous and to be remembered. 

In Flatland, I found interesting that social structures are applied to the shape (angle, length of sides, and number of sides).  The author didn't change the cliche:  the higher class it is, the more of whatever they have than others. 

As far as the illustrations here and there in the book, I would like to say they pleased me so much.  Psychologically, they comforted me who was frequently baffled at too abstract explanations about different dimensions.  I realized how visual person I was.  I desperately wished this book had been a comic book until I went through the first chapter.  However, I became grateful for the fact that I was granted an opportunity to struggle.