And they obviously did not stay awake during science or math. otherwise they would realize that a device having only three dimensions doesn't exist.

I guess I must have fallen asleep during that class as well. How many dimensions does an object have?

In any event, I suppose the reason for that "three dimensional" description is to distinguish the object of the legislation from what are more commonly thought of as "two-dimensional" objects; i.e., pictures and the like.

You are probably right however; insofar as the bill criminalizes display or exhibition of these items it will probably fail constitutional muster. So far as I know, only a prohibition on the selling of such devices has been upheld as not violative of the First Amendment.

Perhaps if the bill were attacked on privacy grounds, ala Griswold V. Connecticut, rather than on First Amendment grounds, it might fail even on the issue of sale prohibition. I can't remember if that argument has ever been advanced or decided.