Hi and sorry that I haven't explained earlier, but it was really early in the morning and I was to tired to write anything. :) So let me explain, #25 it is an abstract brain but also a "think comic balloon" with the gears inside to symbolize thought, the guy on the ladder is the renegade cause he is reaching somewhere [thought/ballon] that nobody else before did, and he is pushing himself, extending his height, using a clever/tricky mean [ladder] in order to achieve this.
#24 cutting edge sharp and clever comedy that goes into the mind of people in provoking ways like a knife inside a brain. Also symbolizes a sharp minded person. The overall design is totally provoking but somehow grotesque that's why I understand that a lot of people [mainstream public or mainstream media] will think of it as to intense, underground, distrurbing and unsettling.
#23 Same idea incorporated into a think balloon, knife inside the think balloon
Thanks for the feedback and I hope you didn't get tired by my explanation. :P