In an innocent way, and mainly based on my ignorance, in 2001 I developed an online toy about building tiny computing objects with logic blocks:
Is my OBBLOG

Ignoring the equivalences of the Karnaugh table, OBBLOG contains all the possible logic gates with two inputs and one output.

This is the partial living OBBLOG Truth Table:

For to build a operating toy, I added forks, crossings at different levels and bit visualizers. (Similar to a light bulb)

However, the toy did not have flip-flops, so you could not make a numbers counter, although small binary calculators 1 to 16 bits.

The toy allows to build little and simple animated toys:

(digital fireplace)

Or more complex constructions:
Binary Tree:

(OBBLOG binary tree)

But from the initial basic logic gates, I discovered that it was possible to build a flip-flop:
(And consequently a counter of binary numbers):

(The obblog allows a closed loop that continues

to circulate indefinitely if not obstructed)

Thanks to this, the obblog could become able to build calculators calculating in binary system and be able to show results in decimal system. But being only in 2 dimensions can never bequeath to do what you can get to perform with Minecraft. (Koala steamed) (see: official Minecraft logic gates)

(OBBLOG feature video)

( 4 bits + sign adder with overflow control + hexadecimal digit with sign )

(without flip-flops)

( work process with obblog )

I posted all this, because yesterday I found similar artifacts along the history of computing:
The article published in Scientific American the December of 1964:

Fluid logic devices, all based in the Coanda effect:

( from: http://miriam-english.org/files/fluidics/FluidControlDevices.html )

(Fluidic amplifier: https://en.wikipedia.org/wiki/Fluidics)

FLUID CONTROL DEVICES:

FLUID CIRCUIT: performs the operation of dividing

by 10 in an all-fluid digital computer

And the conference at MIT:
Referred by: Fluidic computing at Bowles Fluidics:
http://strangebits.blogspot.com.es/2007/05/i-had-pleasure-of-participating-in.html

Coding and computation in microfluidics.
http://cba.mit.edu/events/07.05.fluid/

And the conference from Manu Prakash,
http://cba.mit.edu/events/07.05.fluid/Prakash.pdf

The manu Prakash Thesis: (About "microfluidic bubble logic"), and inside this beautiful Truth table about logic gates and its equivalents in transistors, valves, electrical devices, and fluidics:

(from http://strangebits.blogspot.com.es/2007/05/i-had-pleasure-of-participating-in.html)

Some examples of projected fluidic devices:
(from Prakash thesis)
Integrated fluidic logic gates with a schematic integrated control circuit

The main patents about fluidics, come from the sixties:
https://www.google.com/patents/US4854176
(from wikipedia)

And schema about Coanda effect from Popular Science (Jun 1967 Pag 118) :

And the: Fluidics: Basic components and applications

By: James W. Joyce (1977; Unclassified: 1983):

http://www.dtic.mil/dtic/tr/fulltext/u2/a134046.pdf

And from the conference:

APPLIED HYDRAULICS AND PNEUMATICS U5MEA23 Prepared by Mr. Jayavelu.S & Mr. Shri Harish Assistant Professor, Mechanical. http://slideplayer.com/slide/5675986/

I would like to see these companions of my program, running.

Anyway, everybody can see them inside the Bowles products:

And inside of the Theranos patented devices: (Lab-on-a-chip)

Fluidic medical devices and uses thereof

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An the works of William Phillips (economist)

https://en.wikipedia.org/wiki/William_Phillips_(economist)

His contribution to Economics and Mathematics: The Phillips Curve:

William Phillips and his: MONIAC (Monetary Income Analogue Computer) Also known as: Phillips Hydraulic Computer:

William Phillips and his MONIAC

The Moniac machine is a dynamic model of a working economy:

Img: From: Moniac machine is now on loan to the Reserve Bank museum in Wellington

"Phillips ended up at the London School of Economics (LSE) and became very interested in Keynesian theory. It was at this time that he built the Moniac machine. In 1958, Phillips published his seminal work on the relationship between inflation and unemployment. He moved back to Australia in 1967, before passing away in Auckland in March 1975."

"At LSE [1] Phillips was interested in the circular flow of money model. With his knowledge of hydro-mechanics, Phillips realised that he could build a machine that would take the static circular flow model out of the textbook and into a dynamic 3 dimensional setting, by using water to represent the flow of money. Using a diverse range of materials including bits and pieces from obsolete Lancaster bombers, the first Moniac was created in his landlady’s garage. It was built at a cost of £400 – over $32,000 in today’s money."

"The machine was unveiled in a seminar at LSE in 1949, and Phillips explained how his machine could be used to demonstrate the complex interrelationships between macroeconomic variables such as consumption, taxes, government spending, investment, savings, interest rates and exchange rates. A second machine was built to represent the rest of the world and introduce trade flows into the domestic economy."