I saw this about a year ago or so. I love it. My trays would fit in and I look at them sometimes when I stand there in the dark. I have always thought the marks and patterns developing from developer and tongs was beautiful. I actually have photographed sodium sulfite crystals left in a tray till dry. Strange to me that you two guys don't see what is interesting about it.
Dennis
PS I also love the abstract art aspect of marks and patterns left by years of use on old metal cookie sheets.