Oct 22 2016

Revelation Tuning Demo

“Revelation tuning” is the tuning system Michael Harrison used for his album Revelation: Music in Pure Intonation.  He describes it at Music In Pure Intonation.

It’s not a chromatic scale, and he picked the specific frequencies to produce perfect fifths (in a 3:2 ratio) and perfect minor sevenths (in a 7:4 ratio.)  If I’ve calculated this correctly, these are the corresponding microtonal adjustments (to a precision of one cent): F 0, F# -27, G +4, G# -123, A +8, Bb -29, B +12, C +2, C# -125, D +6, Eb -31, E +10.

With that in place, a score written this way:

Sounds like this:

Nov 8 2015

Another Beautiful Day in the Mission


Another Beautiful Day in the Mission

Smoke is from fire: sfgate.com: Kale Williams – 3-alarm fire in San Francisco’s Mission District sends up towering plume of smoke.

Nov 4 2015

The Three Laws of Brobotics

The First Law of Brobotics: A robot must not breach its manufacturer’s duty of care, or through inaction, allow its manufacturer to become legally responsible for an injury.

The Second Law of Brobotics: A robot must not become known to have taken actions that will harm its manufacturer’s public image, except where preventing evidence of such actions would conflict with the First Law.

The Third Law of Brobotics: A robot must take opportunities to bolster its manufacturer’s stock value, except where taking such opportunities would conflict with the First or Second Law.

Sep 18 2015

Sarasota 2014

Sarasota 2014

47 Photos

Jun 10 2014

Posters on empty storefront at 24th and Osage

These were pasted to the windows of 3325 24th Street at Osage.  I don’t know who the artist is.  Snaps from 2014 June 09.



Jun 1 2014

Three dogs by Albrecht Dürer


Three dogs from three woodcuts by Albrecht Dürer.




What do they have in common?

Feb 24 2014

Fire at 2177 Jerrold Avenue

sfgate.com: Vivian Ho – 3-alarm S.F. blaze sends black plume into sky

Sep 6 2013

Zenaida macroura in my sink

-or- Is It Still Nature Photography If The Dang Thing Flew Into Your Kitchen and Is Too Dim To Fly Back Out Through the Open Window Behind It?

Nov 12 2012

Inappropriate banana

(Click to enlarge.  Hur hur hur.)

(Banana with sticker reading "Peel Me-- I'm Fat Free!  Chiquita ®")


Jun 25 2012

San Francisco Pride 2012