Final answer:
The question seems to be inquiring about the set design for the musical 'Once Upon a Mattress', with specific reference to the use of mattresses that may or may not use a steel coil support system. The prop must be light enough for a gag and typically, for such theatrical purposes, lightweight and easily maneuverable mattress designs are preferable over traditional ones.
Step-by-step explanation:
The question appears to be referencing a specific scenario or prop requirement related to a stage production, possibly Once Upon a Mattress, which is a musical comedy. From the context given, it seems that the mattresses are part of the set design for the show and that there's a particular gimmick involving the top mattress. In custom-made mattresses for theatrical productions, a steel coil support system might not be the ideal choice due to the need for lightweight and easy-to-move properties, particularly if the mattress needs to lift for a gag, as the steel coil system can be quite heavy.
However, the question's fragmented nature does not provide complete clarity on what is being asked. Whether discussing the practical design options for theatrical mattresses or hypothetical questions about mattress technology in a survey linked to consumer purchasing habits is not clear. Despite this, we can infer it's related to mattress construction, whether in a real-world application or within a set design context.
In a set design for Once Upon a Mattress, it would be necessary to ensure that the mattresses can be safely stacked, with the top one needing a mechanism or design allowing it to lift during the performance. John Bagby's detailed construction plan would likely address these requirements. The scenario describes a large pile of 20 mattresses, which also indicates that stability and safety are key concerns in the design, possibly negating the use of heavy traditional mattress components like steel coils.