The Gateless Gate
The Great Way has no gate.
A thousand roads enter it.
When one passes through this gateless gate,
he freely walks between heaven and earth.
The Walking Lesson by Jacek Yerka
For more work by this amazing artist click on the following link: http://http://www.yerkaland.com/about.php
Master Clocks & Slave Clocks
Master Clock driving several slave clocks. Note third one along at the top from the right is a radio controlled quartz for reference
A master clock is a precision clock that provides timing signals to synchronise slave clocks as part of a clock network.
Perpetual Motion
To see and learn more about incredible perpetual motion machines like the one above, click the link below:
http://www.lhup.edu/~dsimanek/museum/machines/machines.htm
http://www.lhup.edu/~dsimanek/museum/newacqui.htm#voet
Escher's Waterfall
The image depicts a village or part of a small city with an elevated aqueduct and waterwheel as the main feature. The aqueduct begins at the waterwheel and flows behind it. The walls of the aqueduct step downward, suggesting that it slopes downhill. The aqueduct turns sharply three times, first to the left, then straight forward and finally to the left again. The viewer looks down at the scene diagonally, which means that from the viewer's perspective the aqueduct appears to be slanted upward. The viewer is also looking across the scene diagonally from the lower right, which means that from the viewer's perspective the two left-hand turns are directly in line with each other, while the waterwheel, the forward turn and the end of the aqueduct are all in line. The second left-hand turn is supported by pillars from the first, while the other two corners are supported by a tower of pillars that begins at the waterwheel. The water falls off the edge of the aqueduct and over the waterwheel in an infinite cycle. (In his notes on the picture, Escher points out that some water must be periodically added to this apparent perpetual motion machine to compensate for evaporation.) The two support towers continue above the aqueduct and are topped by two compound polyhedra. The one on the left is a compound of three cubes. The one on the right is a stellation of a rhombic dodecahedron (or a compound of three non-regular octahedra).
Below the mill is a garden of bizarre, giant plants. This is actually a magnified view of a cluster of moss and lichen which Escher drew in ink as a study in 1942.
The background seems to be a climbing expanse of terraced farmland. http://en.wikipedia.org/wiki/Waterfall_%28M._C._Escher%29
