If a tree falls

If a tree falls in a forest, and somebody (but not you) claims to have seen and heard it, did it make a sound?

Are earthquakes but very low frequency sound?Sounds are just waves which happen to be interpreted a certain way by certain observers. I don't see why something should be labeled sound if it can't be heard. But but what you're doing is calling a radio wave with a frequency of 1Hz "visible light", even though it cannot be percieved by any creature's eyes. No, it was a question directly related to the tree falling question, which was going to lead to another question if you answered a certain way. But apparently we largely agree on the question of the tree in the forest, so it doesn't matter.

I don't see the problem with that. Nobody says "the Sun is shining" on a cloudy day. Right. Only if the hearing person weren't there, then the tree didn't make much in the way of sound. Hah, "by my logic". Right. By your logic, gamma rays are colourful. Or am I pulling strawmen out my ass.There are many methods of observation other than vision and hearing. That's what I was getting at with my "somebody else heard the tree" question. If an electromagnetic wave interacts with anything, then it exists.

This is where our disagreement stems from. I view C minor, red and cold as subjective, whereas waves in a medium, electromagnetic waves and thermal energy are objective.Certain waves can cause sound to be perceived by certain creatures, but so can Diphenhydramine. You missed the point. On a 'horrible', cloudy winter day, the Sun isn't considered to be shining as such, even though it's emitting just as much light as it would on a cloudless summer day. The process hasn't changed, yet the perceived brightness has. The lights remain on, even if I leave the room. The Sun still emits radiation, but I've never been acquainted with a yellow photon. From the deaf person's point of view, there wasn't any sound previously. I assume you meant "can't"?Either way, that's a pretty absurd comment. Would you say that water, pure H2O, has taste or odour?

Yeah, I disagree with the definition of words like "liberal", too. Probably my anti-social tendencies.I'm not arguing for solipsism, but I would like to see you prove that it's "ludicrous". Perhaps in another thread?

I can only venture that it's similar to the odour of helium.

I know it looks a bit rough, but the 1:1 scale model I'm working on out back will be much better. As you can see, Carey's drumming will be at the heart of this engine. The sound produced by his beats will continue to vibrate through the concrete layer, until it's eventually radiated into the vacuum as thermal energy. Once in the vacuum, the heat is focused to rear of the craft by a layer of aerogel, which is held in place by magnets. The radiation will escape through an opening, and Newton's third law will do its thing, propelling the craft to unprecedented speeds.Any design recommendations?Overall, I'm very optimistic about this project. Buyers in both the United States and EU have expressed interest. The only hard part will be getting Daniel Carey on board. But hey, that's what chloroform's for, right?