That's a common misconception. Obfuscation can provide security is the attacker doesn't have the means to de-obfuscate, isn't smart enough to find it, or doesn't have the time/resources to get it. You shouldn't be fooled into thinking you're fully secure, but that's kind of a moot point when talking about WiFi passwords when the attacker has physical access
You seemed to have missed the point of the parent post. It may not be 100% secure, but it's an extra hurdle someone must go through to get the password. It's not just opening a text file in gedit. The alternative to full security doesn't have to be no security.
Presumably there are lots of non-lego parts. I really doubt he could build an air tank out of legos. I am a little interested in if lots of smaller components could be used to make it smoother or if that would cause other pressure issues. Obviously it would be more parts that could break, but it might have benefits.
That's really irrelevant though as the discussion was if "deflation would be good for a while". With deflation, it's difficult to get people to spend money because the "something valuable" will be cheaper if they buy it later. Keeping the inflation rate at around 0 is a viable alternative.
Deflation causes people to hoard their money because it's basically an investment to keep it. That's not something that helps the economy (need them to spend money). Of course the poor are exempt from all that.
It's worth noting that not all LEDs provide good light output. I tested a bunch of them that my parents were trying out and some friends, including a few "natural light" varieties, and only a couple of them turned out to be similar to sunlight. Used a homemade spectrometer (chunk of DVD in a box with a webcam) to see the breakdown in light - most have a huge spike in the blue range, the best were nice and even across all the colors.