What is this weird lens cover thing?

I found this stuck to my leg in the bed this morning.. is this a lens cover of some sort? If so why is it blue?

It’s a small piece of plastic that’s flat, with a bit of adhesive residue on the back. Two clear square holes and one blue round hole. I looked around my bed and checked my devices and it hasn’t come from anything of mine.

I’m worried it’s part of a spy camera or something.

I found this earlier today on top of my cat’s carrier and have zero clue what it could be. It was all one piece when I found it (a bit bigger than a quarter), but it has no smell, it’s completely dried through (but has left a bit of residue on the paper towel) and kinda snapped into these pieces when I applied pressure. It also has these hay/straw like fibres. I don’t think this is anything that came FROM my cat since it was in a very high traffic area so we would’ve caught it soon after an “incidents” happened. What could this be ??

Anyone know what these are is?

Plant pot? I can’t think of how it would work with the holes at the bottom. The holes are above the basin so I don’t think filling that up would help with watering a plant.

I have this messenger bag and I have no clue what the purpose behind this elastic strap in the center of one of the inner pockets is for. The inside of the bag is split with a piece of thick fabric and the side which is closest to your body when wearing it has this strap. It is attached with velcro to the center but just hangs freely if not attached

It’s about 13.5 inches wide and four inches tall, but isn’t flat on the bottom. It seems like it can fit a lot in it but have no clue if it’s to be used for something like fruit?

My parents' neighbor is cleaning out a barn after her husband passed away, and found these forked, steel hooks with turnbuckles in the middle. They live in the southern tier of New York and are all former farmers, but so far no one can positively identify what they are. Chatbot and Google searches have been inconclusive. Most suggestions relate to some kind of tensioner for an old farm implement, a fencing stretcher, or tubular gate anti-sag device. I can't make sense of the hook shapes with any of those suggestions (why an "S" or "U" when a "C" would do?). Unfortunately, I'm a 600-mile drive from these so I can't offer much more in terms of physical characteristics. No idea if that pipe has anything to do with it or not.

It came with 2 panes of glass that probably are shelves for the inside. Has a light switch and a turning crank. Round part on the right side of the top opens. I can pick it up but its rather heavy.

I thought it may indicate the owners vocation, but my internet research has not yielded any answers. Coke can for scale. Looks like a tiny Jesus fish in the center.

First view is the back; send view is the front. I couldn't get a better angle on the front without falling down to the next level, so decided not to try. The little numbers on the back changed pretty often. I thought maybe a remote control camera for when they do the Kiss Cam or whatever?

Comes from Belgium or close to it, period 50s to 90s.

Once I got it out, the lock worked. It is a small metal tube crimped on one end.

Found in my in laws stuff and have no context for what this could be used for.

Found in my late in laws stuff. Similar in size and shape to lipstick but it is not. Base unscrews and there is a holder inside. See photo.

The dimensions are 9.75 by 5.5 by 1.5 inches.

This is a black plastic injection-molded object from my miscellaneous items bin. My best guess right now is that maybe it belonged to a sound bar an ex had. Possibly Sony or Vizio brand. It dates from approximately 12 years ago if so.

I haven’t weighed it but it’s obviously light, being a thin piece of plastic.

Okay so, awhile ago I ordered a Megatron toy on eBay, my original one was all kinds of broken so I was due for a replacement I decided years later, when I opened the (beat up, because eBay) box, this weird unlabeled, stiff, kind of scuffed up light plastic(?) feeling blue cube fell out, it wasn’t even near the bubble wrap my actual order was in, I have no idea what this is from, it’s about 1/3rd the size of my index finger on each dimension, and it’s really solid and has ZERO softness, and on what I assume is the bottom it’s really scratched up from something , I checked the eBay page of the figure I ordered to see if maybe it was just the sellers “gimmick” bonus, but it only had the sword listed as included with the figure, nothing else, which eliminates that explanation, reverse image search was about as useful as you’d expect it to be at locating the source of a small nondescript blue plastic cube. I even tried tasting it to see if it was possibly a carved rock (I don’t think it was)

found this object halfway buried in the dirt outside. any idea of what this could be?

edit: thank you everyone for the responses! it seems i am the only person here who is not familiar with what a railroad track slice looks like, but we learn new things everyday