RF Cafe began life in 1996 as "RF Tools" in an AOL screen name web space totaling
2 MB. Its primary purpose was to provide me with ready access to commonly needed
formulas and reference material while performing my work as an RF system and circuit
design engineer. The World Wide Web (Internet) was largely an unknown entity at
the time and bandwidth was a scarce commodity. Dial-up modems blazed along at 14.4 kbps
while typing up your telephone line, and a nice lady's voice announced "You've Got
Mail" when a new message arrived...
All trademarks, copyrights, patents, and other rights of ownership to images
and text used on the RF Cafe website are hereby acknowledged.
Maurits Cornelis Escher, aka
M.C. Escher (1898 – 1972), was
a Dutch graphic artist known for his often mathematically inspired woodcuts, lithographs, and mezzotints.
These feature impossible constructions, explorations of infinity, architecture, and tessellations. If
you do a search on Escher's waterfall, you will find a lot of information that explains how his methods
tricked the human brain to perceive something that is not what it appears to be. There are videos, physical
models, computer models, paintings, drawings, and written theses. Even knowing that the image does not
comport with real-life experience, figuring out exactly how the spoof is executed can be difficult -
if not impossible (to some). In this video, a resourceful young man uses a physical model with a carefully
placed camera to pull off the illusion using tinted water that appears to actually flow through the
contraption. Lots of people responded to his video with ideas, but I'm not sure whether anyone actually
got it right. Can you figure out how he did it?
Escher's Original Lithography
Escher's Waterfall in LEGO Blocks by Andrew Libson