Introducing The Test Track 4 Logo

Here it is:

There's a whole lot more to get to about this (I'm still trying to get the SVG up), such as the process of arriving at this design for the logo (notice how the four shapes in each quadrant form a serifed Arabic "4"), as well as its practical applications (such as repairing vinyl record sleeves by folding the logo in half along the sleeve's edge), but here are the precise geometric instructions for recreating this logo in any medium:

Construct a circle of 32x32 dimension, with .16 further radius of border (.32 further diameter). (Units are not provided because this is scale-independent: could be fractions of an inch, millimeters, whatever. The dimensions of the circle are the defining grid: the definitional unit is whatever's 1/32 the width of the circle. The reference implementation SVG uses 32.32x32.32 pixels.)

Quarter the circle so that the upper-left and lower-right quadrants are black, and the others yellow.

Set the origin (0,0) for future instructions at the center of the circle, where these quadrants meet.

Place 7x7 red squares at (7.5, 7.5) in the yellow quadrants (so their corners go from (3,3) to (10,10)), and overlapping 10x4 yellow rectangles (two sets of two, one per quadrant) in a "T" shape with their joins at (-8, 11) and (8, -5) respectively. The vertical rectangles' outer vertical edges should align with those of the red squares, and the rectangles closer to the center (vertical top-left, horizontal top-right) should align with the horizontal edges of the red squares closer to the center.

For the monochrome version, replace the red squares with four 1x7 vertical rectangles, spaced 1 apart; in other words, subtract the even columns of the pixel grid. Note that the lines should be (mostly, after transformation) vertical, not horizontal; the lines are only changed to horizontal when used as an analogy for "blue" lozenges, such as in the logo for tt4.net (Test Track 4 Network Operations Services, aka "Blue Ops").

To fit this shape into the circle (as the Ts would otherwise protrude beyond its bounds), apply a matrix transformation to the shapes of [[0.9, -0.1],[-0.1, 0.9]]. This scales the shapes in all 4 quadrants 80% along the black-quadrant axis, but keeps the lozenges in the same position across the center of the logo.

Note that this means that if you're, say, constructing the logo out of construction paper, you have to size and plan all of your cuts on the basis of this transformation before cutting anything. Always read the full instructions first!

UPDATE 2026-05-05: Fixed image.