Possible Clues:

• Parts of recliners
• Where elbows may collide
• Airplane seat dividers
• Some are ergonomic
• Checks about 1000 supports
• You can lie about them as a judge from another time relaxes
• Places to rub elbows?
• Chair pair
• Gives some elbow room to those on the right and the left
• Airplane passengers might battle over them