Hi folks, I stumbled on something odd about the "copy" command, which is used in a "layout". Normally, commands in a layout are interpreted in sequence, so if you hide something with one command, then show it with a subsequent command, it will use the second one, and show it: symbol-hide point stalactite symbol-show point stalactite #this one wins If two copy commands copy conflicting information, the first one is used, not the second. Assume the following .thconfig: layout first symbol-hide point stalactite symbol-hide point water-flow symbol-hide point dig code metapost let l_wall_bedrock = l_pit; endcode endlayout layout second symbol-show point stalactite code metapost let l_wall_bedrock = l_wall_debris; endcode endlayout layout third symbol-show point water-flow #overrides the copy below copy first #first one wins with copy copy second symbol-show point dig #overrides the copy above symbol-hide point anchor symbol-show point anchor #second one wins normally endlayout source "copy.th" select copyMP@copy export map -proj plan -layout third -o "copy.pdf" Use a basic survey with a default (bedrock) wall, stalactite, anchor, water-flow. I would expect the wall to look like debris, the stalactite to be visible, the anchor to be visible, the dig to be visible, and the water-flow to be hidden. But instead, the wall looks like a pitch, the stalactite is hidden (!), the anchor is visible, the dig is visible, and the water-flow is visible (!). It seems very inconsistent that the anchor and stalactite are visible at the same time, because it means most commands are executed sequentially, but copy commands are executed in reverse. It also seems inconsistent, but understandable, that both the water-flow and dig are visible. My understanding is therefore that: * All copy commands get moved to the top of the layout that they are inside, no matter where you put them in the layout. (Understandable but weird.) * Copy commands get executed in the opposite order from how they are specified (inconsistent with other commands). I couldn't find anything in the Therion book or wiki describing this, so is it a bug or expected behaviour? The book just says "copy <source layout id> . set properties here that are not modified based on the given source layout". That wording is really minimal, but it seems to suggest that commands in "third" will override anything in "first" and "second", which rather poorly explains the first bullet point. It does not explain the second. Therion 6.1.0, Windows 10. Cheers, Tarquin