A Raisin in the Sun - two contrasting characters

In Lorraine Hansberry's A Raisin in the Sun, Mama's two children, Walter and Beneatha, constantly argue with one another because they are siblings but also because they are two contrasting characters. One could also call Walter and Beneatha foil characters. Walter is an idealist; Walter dreams into a fantastical future full of money and his idea of happiness. On the other hand, Beneatha is a realist. At one point, Beneatha says to Mama, "I mean it! I'm just tired of hearing about God all the time. What has He got to do with anything? Does he pay tuition (50)?" Beneatha sees things based on what she can observe like a scientist or doctor. Beneatha also has a great intellect. The exact opposite of this would be Walter's character. Walter lacks Beneatha's intellect. This becomes quite apparent at the end of the play when Walter gives the money to Willy Harris who ends up making a run for it. Beneatha said it the best when she said that not even Travis would have trusted Willy Harris with the money. Walter was simply blinded by his idealistic future which made the promise of Willy Harris's business seem like a perfect situation for him. Walter's inability to see through the scheme seemed not to come as a surprise to Beneatha because of her realistic point of view. Beneatha was realistic enough to expect this out of Walter although this did not stop her from becoming upset about the situation.