For those suggesting such things as solar panel that give off SPRK in response to PHOT, I was actually planning on coding a similar element at somepoint soon. I was going to call it "Photon Detector (PDET)" and make it an element that could be deposited as a single pixel and would absorb photons and output 1 SPRK per PHOT that it absorbs. Good, yes?
Also: Teleport could be very interesting indeed. Program a TLPT wall element with the line tool (like with FAN) to connect it to an output wall element.
Excimer-Sun-Software May be 1 SPRK per 2 or 3 PHOT?
seehp So it would be 1 pxl entrance and 1 pxl exit? May be better to have teleport entrance wall and teleport exit wall? In this case particles would teleport to the nearest exit
Plastic! It has low melting point(but not so low) and deforms under pressure but don't dissapear. And everything that you can imagine i don't have any ideas now.