As I previously mentioned, the vision bar is my robot's equivalent of eyes. I made a prop version out of 1/2" angle iron cut to about 6" long, but it is really up to personal preference. A 6" by 2" piece of clear acrylic is also cut. I then clamp the pieces together as shown in the second photo and drill 2 3/16" holes, one through each end of the angle iron through the acrylic too. This is done for each long edge of the assembly, then 1-1/2" bolts are put through with nuts on the exiting side.