This pencil sheet is one of the more unusual sheets I've seen. On the front is the typical pencil sketch, but on the reverse is some light pastel coloring. Normally, all you would see is the pencil sketch, but when you hold the paper up so that there is light behind the sketch, you can see Casper change color! Interesting... But I have no idea why someone would modify the sketch...
Unusual Casper Sketch
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Pencil sketch of Casper thinking. Note: "M26" "Do not ink bridge on nose" If you hold up Casper, you can see through him to the sheet (so he looked like a ghost). 3-hole punch at top of page. [12.5”W x 10.5”H] Acquired 1996. SeqID-0446