Felix' Workshop

Draw on a grid-snapped canvas, from an 8×8 sprite up to a full Game Boy screen, and export exactly what you drew as a real SVG.

See what a photo carries besides the photo — GPS, serial numbers, timestamps, the caption someone left in it — and choose field by field what to strip. The pixels are never re-encoded.

Write music for the NES sound chip in a pattern grid — two pulse channels, a triangle and noise — and export it as a WAV. The chip is arithmetic here, not samples.

Take a sound apart into the sinusoids it is made of, then put it back together and listen to what is missing. The part that is missing is the honest part.

Lay coloured squares, circles, triangles and hexagons over one another and watch every overlap take the colour those two make — as ink on paper, or as light in a dark room. The sheet exports as a real SVG.

Hold the space bar down and it reads your timing back as dits, dahs and letters. A short press is a dit, a long one a dah, and the length of the silence decides where one letter ends. The alphabet is on the page and a paper tape shows the units you actually sent.

A typing test for a morse key. Words go up — with the dits and dahs under them, or without — and the run is scored on the two speeds morse has: the one your elements imply, and the one you actually got through. The gap between them is the reading.

Reduce a photograph of a face to one bit. Two models find the head and label every pixel as hair, skin or clothes, and each part is then thresholded on its own terms — the clothes solid, the face as fine as you like — out as a PNG or as real curves in an SVG.

Drop in an SVG and a chain of rotating circles draws it as one unbroken line. Every shape in the file is joined into a single closed curve first, because a chain of circles can draw nothing else, and the number of circles is yours to set.

Merge, split, extract, reorder and turn pages, every one a real preview you can pick up. The PDF engine underneath is written from scratch, with no library involved.

Type the squares and it counts every card that list can make — exactly, however many digits that takes. Ask for as many as you want and it prints them, one to a page, with your logo or a QR code in the middle or a corner.

Turn a GPX, a KML or a map link into a printable sheet: the path on a map, and every turn numbered — worked out from the shape of the track when the file does not say.

Eleven distributions in up to ten dimensions. Every run prints the seed it used, so any set of numbers can be drawn again.

billowy and almost are already in alphabetical order. Nearly every other word would be too, under some other alphabet — this finds the nearest one and counts the letters you had to swap to get there.

Build a network a unit at a time and then take it apart: the logic gates, Vienna's tree registry or your own CSV, one observation through it by hand, and every neuron open to a click. It trains in the tab.

A program is a grid: cases down one side, operations along the other, one expression per cell. Objects box the rows and functions box the columns. Regroup it, add a case or an operation, and watch the cost land on opposite sides — then walk one call down both roads and see where they meet.

The sky over any place, at any hour: nine thousand stars, the eighty-eight figures, the planets, and the Moon with the phase it actually has. Every position is worked out for the moment you ask for rather than looked up, and anything on the chart can be picked to find out what it is and how far away.

The path of totality from a satellite’s point of view: exact timings for any point you target, the western ridge that might hide a low Sun, and the cloud outlook — good zones and bad, ranked.

Counts down to the next solar eclipse visible from a location you enter, draws the Sun as it will look from there, and lists the time of every phase. Every eclipse to 2035 is on the strip, partial ones included, and any of them can be picked instead.

Everything your browser hands over before you touch anything, the requests it is making right now, and what a single lookup adds. The parts that send something are buttons you press.