Reentering the house after a visit to the pork butcher's Bloom is distracted by Boylan's letter to his wife and forgets where he has left his hat: "Must have put it back on the peg. Or hanging up on the floor."
This humorous way of referring to things left or piled on the floor was a popular idiom in Bloom’s day:
I found fur cap and cloak hanging up on the floor in the cloakroom.
Daily Sentinel (Milwaukee, Wisconsin) (1873), 29 June, p. 29
I'm open to admit I laughed the heel of my boot clean through the brim of my own chaste 'topper', which was hung up on the floor under my seat.
Pick-me-up (1890), vol. 2, p. 118
By an effort I controlled myself, and began to take my coat and hat and veil and things off. As I could see no pegs anywhere I hung them up on the floor.
Cynthia Stockley, The Claw (1911), p. 81
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