14 years ago I got this tattoo, now I want to turn it into a sleeve

I’ve been struggling to figure out a good transition from this PR Flag and frog to something more like a stylish design or even anime-ish. People have said to stick with a jungle theme but it’s hard to visualize something. Any ideas are good ideas! Thank you!

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First

I had a long standing plan for what my first was going to be whenever I got the courage to finally get a tattoo. Then one day a friend showed me a picture and said “we should get these”. Now this is my first tattoo because there was no way I could say no to this. I know it’s not “amazing” but I love it and have no regrets

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What is this thing bolted near the door of our garbage disposal area in Germany? It's bit bigger than my fist. It not a lock.

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This clump of dust and hair just appeared in my paper bin. Never had these in my flat. Single with no pets. Any ideas where it comes from & how it got there?

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Found this metallic(?) disc submerged in a little stream in the italian alps. It's about 10cm in diameter and 2cm thick. I didn't take it out, in case it's some kind of explosive (which I doubt).

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What is this remote control type of thing? Keychain sized, needs 2 AAA batteries. May possibly emit noise?

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Some kind of metal cap on the ground outside a prewar NYC apartment building

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What is this thing? 5" rusty metal tool with grip and a wrench, found in western North Carolina

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Eastman Kodak Co. solid aluminum (?) block with dial and measurements

The two threaded holes are the only thing other than the dial on the cube. I image this is part of a camera setup, maybe mounted on a tripod to get precise image adjustment for the camera? The dial has very small threads and takes quite a white to spin. There are other measurements on the shaft that the dial is mounted on, I think 1-10?

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What is this tank next to our hot water heater?

It is very loud, is it safe to put a towel over it to reduce the rattling noise?

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What is this horizontal piston-like thing connecting the body of two passenger train carriages with each other / with the bogey?

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