What's it called when.... Is there a term for the phenomenon that I experienced last weekend ? I got out the steamvac to clean carpets and noted the dirty water collector tank was missing. I looked all over the house and garage and even looked on the patio for it. This is not a small part. It is about a foot deep and ten inches wide. I could NOT find it. Today, I went to iron a shirt in the spare room where the steamvac is kept and guess what was on the ironing board? Plain as day right in front of my eyes!!! :surprised I had probably looked directly at the tank who knows how many times but didn't see it.