Very nice... but... "which is just open on top (don't make extra holes in it)"

Please check out the SBS... It shows why this piece does actually conform to the rules...

After looking at the SBS, I tend on agree that this is on theme and clever, as long as we don't take the 'plain cardbord box ' too far, but then the goal also mentions a camera box as being OK.
As so often, the wording of the goal could have been better.

Cool. I agree. Very imaginative

Whew...sigh O relief... The idea just dreamed itself up, and the box molded around it. My muse woulda had a tizzy if it got sentenced to limbo. - on to my next mistake

IT conforms with the rules and goal of the contest. Next time if there is any chance of a question like this... just submit an SBS.