Swimming Visuals

This would roughly be the overhead reach of a 6 foot tall Figure in a swimming crawl position at full extension in the water.
For this image to make full sense A basic measurement of Lego building blocks has to be made against the scale as established against the Square-hex form.
A standard sized block is about 3/8ths of an inch in height, or roughly 1 and 1/2 quarter inches on quad-graph-paper.
Using 13 inches for each quarter-inch side this sets a standard height of about 18".
As each standard height can be reached by snapping 3 flat-blocks together a flat-block is about half a foot in height.
This makes the Lego representation somewhat informative.
The bracket flat-block is roughly where the shoulder would be, the white flat-block shows a rough idea of where the toes would extend if pointed out for kicking, the holes at the midpoint and head are roughly where the center of gravity and the head would be, and a few others.

It can help a LOT with proportional visualization.

That's a possible Giant, Human, and Halfling next to a scaled height construct with 10, 12, 15, and 20 foot ceilings shown.
This is assuming that Giants and Halflings are in fact proportional to Humans with a Halfling being half the Humans size and the Giant being double the size.
Perhaps you see things differently but this gives us a starting point from which to build with.
And I don't require Lego, blocks.
By sticking to english measure (or metric, pick your poison) many real-world materials work out well for height demos.
A beer carton can be cut into strips, 8 of which stack to a height of a quarter inch.
This gives each strip an equivalent of 1.625 inches judged against the 13 inch square-side.
2 strips are 3.25 inches in height... a Scale-hex quarter-inch square the size of the palm of your hand...
It's rarely so important, but SO nice to have available.
And modeling is a lot of fun when it contributes so well IMO.
It's much simpler to make my point about a swimming Figure (or sprawled out dead) taking up more than 1 hex by putting a scaled component on the board rather than spending many minuets trying to describe it.

Anyone wanna find the major hole in the Giant, Human, Halfling Lego pic?

Hexes

This is how I draw a basic mapping unit I call a Battle Map.
It's a single standard sized 8" by 10" page of quarter-inch graph paper with a hex-grid of 80, 1" hexes drawn in a geomorphic pattern that allows additional pages to be added easily.
In the scale of TFT AM each hex represents a distance from side to side of 1.3 meters.
That's roughly 4.3 feet across or about 52 inches, making each square 13 inches across or just over a square foot per quarter-inch square on the graph paper.
That gives a "good enough for government, or gameing" count for area.
I can take a lot of different scaled drawings, like a magazine of different home floor-plans, and drop it onto a map pretty simply.
If the situation calls for a more detailed accounting then I focus on the hex in question a bit closer.

I call this a Scale-hex.
Looked at from a TFT AM scale each quarter-inch square represents an area of about 3.25" square.
The rule of thumb I use for this area is if something can fit in the palm of your hand then it will fit into a three and a quarter inch square space.
I can take information like the shipping dimensions of an object right out of a catalogue or web site and represent it to a fair approximation quickly.
This makes the construct useful for issues like reach and facing as well as simple questions like just where exactly in the hex was the Ring of Power dropped?
I encourage pantomime on the part of my players and can try to represent how their visualizing an Action more directly with this setup, especially when the players Figure is of radically different size than the player.

It's certainly not a scientific system, but I can take a lot of real-world data and plug it into the game-world fairly easily with it on the TFT scale.
A neat little discovery was how effective this format is at a range of wider scales.
I've tried to keep a focus on what can reasonably be done on a "kitchen table" area with commonly available equipment.
No stuff that's "special order" should be required for play IMO.
So I ended up with those 1" Square-hexes on quarter-inch graph.
It turns out that by sticking to common standards for paper size and measurement this way of drawing the hex "snaps to" other grid systems pretty simply.

Of course there are problems with this on the scale of the planet.

It's not perfect, but it's something, and in many mapping systems, like Section, Township, and Range, it ends up working out really well with each quarter-inch square equaling 1 square mile on my county maps of Oregon for example.

Because Battle Map pages are geomorphic I can lay them out in a rough approximation of a hex-grid and use 1 page of Square-hexes to represent a layout of up to 80 Battle Maps.
I can squeeze a football field or an old school baseball field onto a page with that method, with each hex representing a Battle Map.