One compass and straightedge construction a day, from a fixed sequence of thirty, drawn on paper with real instruments and photographed here. The page names the figure and keeps the date. It never tells you what a figure means, because the meanings were attached later and that is what the season is about.
Today's construction
Number
1
Figure
The vesica
A compass is a physical instrument and this page is not one. Draw it on paper, then photograph the sheet if you want the record kept here. The page will not draw the figure for you, and it will not show you what it should look like, because a construction you check against a picture is a tracing.
The sheet
No photograph today.
Optional. The construction counts whether or not you photograph it.
Constructions
The honest limit, stated first. The figure at the center of sacred geometry is the first proposition of Euclid: his construction of an equilateral triangle uses exactly the two overlapping circles later given a Latin name and a cosmology. The golden ratio in the Parthenon traces to a German writer in 1854, not to Athens, and the measurements that prove it are chosen after the fact from a building with many available ratios. The 2007 paper on quasicrystal patterns in a Persian shrine is real and its own authors state its limit inside the paper: the workshops had a tile set and a tradition, which is a more interesting fact. The labyrinth at Chartres was almost certainly walked from the time it was laid; what 1991 supplied was the meaning, not the walking. None of this requires the constructions to be sacred. They are exact, they hold your attention completely, and the sixth arc lands on the first mark or it misses by the width of a pencil, which is the only thing in this hub you can check.