ripple

Some time ago, I tried coming up with my own water-drop/ripple simulation for making a small animated-gif background (akin to the moving backgrounds, like clouds, ocean breakers, etc, that are so popular as church lyric-projector backgrounds right now). Basically, I had a sinusoidish curve, decaying with radius and time; I simulated a dozen or so of these drips, usually centered off-picture, and added the curves; it made for some nice randomish moving water-surface. (Sorry, I cannot find where I put it for now.)

Continue reading ripple

PseuDoKu Details

What I’m calling variants of sudoku, whether simplificiation of or extrapolation from the original.

My daughter enjoys playing the “number game” on my phone with me; I tell her where to put the next solved number (“put a 2 between the 5 and the 6 in that grey box”, etc.). I’ve thus started doing simpler grids on the chalkboard — with just a 4×4 grid, and one number missing from each row or column, and haven’t made the logic require one-of-each-per-2×2. The other day, she asked for “1-5” instead of “1-4”: since I haven’t introduced her to the boxes, the fact that 5×5 cannot have the sub-boxes is irrelevant.

Continue reading PseuDoKu Details

bottomless pit: ultimate bungee

So a radio host’s silly quiz game had the failing caller “fall into a bottomless chasm” or some such phrasing. That got me thinking: it’s bottomless, so there is nothing downwards from it; but if it’s truly bottomless, you’d go through the center of the earth, at which point you could hit a “ceiling” at a rather high speed, since you’d be going upwards at this point. But if there were no ceiling, that would be like ultimate bungee! Continue reading bottomless pit: ultimate bungee