One part of the Wallace Collection I didn't spend much time in was the armour and weapons section. I did, however, have time to snap this horse's helmet, which reminded me of the lines above from Blake's "Auguries of Innocence" (one of my favourite poems).
This, in turn, reminded me that I have no idea what "polar bar" is supposed to mean. The online OED is free this month, but it wasn't any help. Does anyone have any ideas?