But are exponentially better than vacuum tubes. Electricity sucks for finesse, good for bulk power.
Therefore, let's invent a new "transistor", name it whatever you like, but attribute it correctly please. A transistor merely holds a value of high or low. Therefore, if the new computer medium is to be light, a simple transistor would be a prism mounted on a pole. You merely rotate the prism and hold the beam of sunlight fixed and voila, you get any number of values you desire (binary digits are pre-school, quaternary digits ready to go today, etc). Speaking of power, a focused beam of sunlight is way cheaper than generating electricity, running it through miles of wire, then pumping it into our homes.
