Early design concepts for the Wii U controller (as seen in the Nintendo Land “Iwata Asks”)
The first one was just a Wii Zapper with a monitor attached, and is what lead to the 3DS getting a gyro sensor.
In regards to the second one:
It’s very high-tech—a monitor and controllers stuck together by double-sided tape. (laughs)
That’s all that needs to be said really.