We'll leave you semanticists to debate whether this actually qualifies as "furniture," but it checks the main box for us: It's meant to be sat in. Float tubes or belly boats, as they're called, are essentially inflatable easy chairs used by anglers who want to get further into the water than standing on the banks will allow them to reach.

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While you can buy them in motorized versions, the classic float tube is silent--the better not to scare fish off, we imagine--and propulsion comes via the user's legs, which extend into the water; flippered feet make this easier. The armrests are loaded up with compartments to hold gear and supplies. 

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There are ergonomic considerations as well: A "stripping apron" across the user's lap serves as a worksurface, and there are measurements ticked across it so the user knows which fish to throw back.

Here's a look at one in action:

Here's a better look at how you set one up and get it down to the water:

What most surprised me about these is the relatively affordable cost. Cheap ones start at less than US $100, and it looks like you can get a good model for around $200. Given the amount of material and sewing labor that goes into these, I'd have imagined the price to be much higher.