There is also the entertaining effect sometimes obtained when drawing sets of close, parallel curves, say with an algebraic 2D function. Often shapes appear by what I assume is a sort of Moire interference with the grid of pixels, usually taking the form of ovals, hyperbolas and Napoleon hat cubics (just why these forms I haven't worked out yet).
When a zoomed plot is done they disappear. In the case of my code they're an interesting bonus.
When a zoomed plot is done they disappear. In the case of my code they're an interesting bonus.