Of course!

You've come this far, so you may as well continue. You begin the process, and watch as your cave became wider, taller and deeper before your eyes, stretching farther back into the cliff. Arches form in the walls, 3 to a side and one at the far end, each filled in with blank stone. Eventually, the room stops growing, having taken a rectangular shape, 16ft wide and 50ft deep. At some point, the smooth walls morphed into stone slabs, and the floor became cobbled. Iron sconces filled with blazing torches illuminate the room with a dull flickering glow. A minimalist but functional entrance, fit for a sprawling dungeon if you were so inclined - but still no sign of water anywhere. Concentrating on the walls doesn't seem to do anything more, so you switch your focus to the first archway, which pulls up a 'Build Menu', containing a long list of tunnels, rooms and furnishings split up into several tabs - one of which, labelled 'Special Features', contains your spring!

This revelation is swiftly followed by a celebratory loop-de-loop, which you follow up by literally punching the relevant button. However, instead of creating a progress bar like you were hoping, or indeed just plopping it down effort-free, the text simply expands, revealing a large selection of forms for the spring to take. 'Portal to the Depths' immediately catches your eye, for obvious reasons, but you decide that'd probably be tempting fate and resolve to check it out later. Instead, you select the simple and cheap 'Drinking Fountain', a stone bowl filled with water from above, and attempt to place it into the corner of your entryway, but once again a new popup appears.

Error: Cannot place furnishings other than traps and defences in the Lair Entranceway.
Please build another room.

Damnit, more hoops to jump through? Selecting the most basic option you can find, an unfurnished square room, 16ft to a side, you place it down by the first arch on the left hand side and once more attempt to place a drinking fountain inside. You also find a nest option, and figuring you may as well place it now, drag it into the back right corner, vertically opposite the fountain, which is on the same side but closer to the door. After a moment's consideration, you also put in a long shelf along the left wall, low enough down for it to double as a desk, and a fire pit in the center to keep yourself warm. Then you hit confirm, and are finally met with a progress bar!

Not that this particular bar is particularly worthy of celebration. It's the longest you've ever seen, a good 3ft wide, and each hit with your incorporeal fists adds barely a fraction of an inch to the total. Even when you remember, and then subsequently pull out, your new hammer, it takes five minutes to move the bar far enough along for it to be visible, and the percentage written above it reads 0.12%

Nevertheless, you spend the day tirelessly bashing away at the wall, gradually falling into a lulling rhythm as time passes. You grow thirstier as the day goes by, but as an air elemental water and food aren't so much requirements as they are comforts, so you persevere, and by the time the day is finished you've filled a good quarter of the bar. You turn, resigning yourself to another night sleeping rough - only to find yourself blowing straight into a pigeon, staring at you with a cocked head. You try to shoo it off, but instead it waddles in closer and drops a mouthful of half-eaten berries at your feet, before flapping away into the night. Gingerly throwing the pile off the ledge, you realise that this is probably Elemental Liegelord at play. Good to know you have a backup food source, if you're ever **** enough to eat it.