Both Cassie's and Justin's projects seemed to convey the idea if surrounding a smaller space within a larger space. Justin's approach was to use rounded edges, and to leave a gap in the wall of each space. By doing this, his project causes the observer to think about how many spaces his project really creates.
Cassie's project takes a more angular approach to this idea of surrounding, with both of her spaces resembling the star of David. In addition, Cassie leaves no gaps in the walls of her spaces; they are all completely closed.
Cassie's and Justin's projects were also similar in that there was some dispute on whether the negative space around their projects created more than two spaces. But in the end we decided it's all about how you look at it, and that every one i going to see something differently.