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Scents can leave a bigger impression, I think. Something unseen seems more memorable.
Do you have the link to that contest?

Thank you wakeupkitty. That's one very interesting contest. I must read through it a few times more because I kept getting the rules wrong. Sigh. I'm not good with instructions.

 last month 

it's not difficult. Just take a photo of a hat and wallet and post it as a comment. Next you mention: hat, wallet and and something else we can see on your photo.