The Birlstone manor house is an interactable object instead of any of the pyramids on the sides. I cannot find any angle or position where the pyramids can be selected over the house. Usually if the problem is my own precision, there would be at least a frame or two of something else.

引用自 Zimrath：

The Birlstone manor house is an interactable object instead of any of the pyramids on the sides. I cannot find any angle or position where the pyramids can be selected over the house. Usually if the problem is my own precision, there would be at least a frame or two of something else.

Thank you for reporting.
The collider (turnable property) of Pyramids on the sides of the house is deactivated unless you've completely finished the Sign of Four, which means you got that script.
The reason why I made this house an interactable object by defining it a drag target is that I wanted to relate it to the novel.
If these Pyramids couldn't be turned after getting the Sign of Four, I may consider to cancel the drag target property of the house.

I'm pretty sure I'd completed the Sign of Four (I am positive there was only one empty spot on the table of books by the time I reported this, but just trying to think back makes me wonder if I'm remembering things wrong) by the time I made that post.

(Edit: It's not actually relevant to what happened, but I'm also coming back to acknowledge that I can see very clearly that I was wrong about how many books I'd found, because there were at least two others missing.)

I'll try again, and see if I notice something that I didn't see last night. I'll also make sure to try and do the correct order, too, because I tend to go through puzzles in the order that I can complete them, and I believe I was able to complete Hound of the Baskervilles (I know for a fact that I'd assembled the hound picture) right after Sign of Four.

Following up: It did work this time, and I definitely didn't do anything differently on Sign of Four from what I did last night, but immediately afterward I checked the pyramids. I think the problem may have something to do with the fact that I checked the train station, saw that it had a place to put the ticket, and that led into the Baskervilles, which might have messed with a trigger somewhere.

引用自 Zimrath：

Following up: It did work this time, and I definitely didn't do anything differently on Sign of Four from what I did last night, but immediately afterward I checked the pyramids. I think the problem may have something to do with the fact that I checked the train station, saw that it had a place to put the ticket, and that led into the Baskervilles, which might have messed with a trigger somewhere.

Thank you very much for playing/testing it again! You were right about the connection between the Sign of Four and Baskervilles. There was no order of priority between Valley and Baskerville after you finished the Sign of Four, which means you could do them alternately or simultaneously.
And I checked my logic connection of those puzzles again and found nothing mis-connective or cross-connective. So it might be an occasional error.

Edit: I have improved mechanism of puzzle order in recent update.

I've been trying to solve this room, but I'm concerned I may have broken something, as I accidentally double-clicked on one of the "projectors" and it shifted into a position pointing straight up and cannot be restored. Is this game-breaking?

引用自 Xandyr78：

I've been trying to solve this room, but I'm concerned I may have broken something, as I accidentally double-clicked on one of the "projectors" and it shifted into a position pointing straight up and cannot be restored. Is this game-breaking?

Right. This issue hit me twice and is considered to be some sort of game-breaking. Players should be careful with it.

引用自 Xandyr78：

I've been trying to solve this room, but I'm concerned I may have broken something, as I accidentally double-clicked on one of the "projectors" and it shifted into a position pointing straight up and cannot be restored. Is this game-breaking?

I've found its basic error, now they are improved and no longer shoot straight to the ceiling.

引用自 FrostyBeak：

I've found its basic error, now they are improved and no longer shoot straight to the ceiling.

That's fantastic! Thank you so much!