The Rooms of Antiquities, the pleasant female voice can be heard from the earbuds of the electronic tour guide, contain a number of peculiar objects, many of which are not, in fact, ancient. Several of them were in fact thought to be ancient until they were discovered to be forgeries, or merely more modern pieces confused for older ones.
... Eventually, he realises that his last sentence came out in a bit of a squeal.
Cough. "Uh, I mean, this is really fun."
And then: back to alteration! Whee!
"Oh my god your fragile masculinity can't even withstand having fun with magic. That's also kinda adorable."
Kero teaches him how to meditate. He doesn't have a staff so he has a harder time at it.
Changing the colors of whole blades of grass, then changing colors of parts of it, making a patchwork, then changing colors so it's a gradient, then changing the shape of a blade of grass, oh he can do so many things with that, and combining that with the colors, and then changing the texture, and changing the material, and changing the size, and warping the object, then changing some properties that have no right being on a plant, like magnetism; there are so many things to do. He's doing so many things. Eeeh!
He seems to be starting with basic changes and gradually compounding them, where possible.
There seems to be some complexity rule, there, to how much he can change at a time. He can stack size and shape and colour, but he can't stack any of those with magnetism, unless he does material first. Only one "change," including however many modifications he's stacked, can be activated at a time, and once he does another the previous one is undone.
He seems to be quickly making changes and then undoing them to add a new change. Eventually, instead of working on stacking changes, he decides to try to make really precise changes, seeing how small a colour change he can make before it just stops working.
... Apparently it doesn't "just stop working". It gets small enough that he can't make out any difference before and after the change, and the same goes for when he tries size. It's probably not that useful, but heck is it fun.
He can go on doing that for a while. Sadde will be here meditating and talking to Fly and Windy and becoming best friends with them.
Eventually, Theo stops for lunch. Getting his food out of his bag, he asks Sadde, "Having fun there?"
He slowly emerges, then grins. "Yes! Fly is adorable, and I like Windy. And I don't have food."
"I like Windy too. And maybe we should go buy some food in that case - I'm fine with that."
"Yeah, Change is great. It's so much easier to think of things to do with a vague concept."
"So... Whaddya like to do with your time?" asks Theo, somewhat lamely. Oh no, dreaded smalltalk.
Sadde giggles. "School. Walking around the city. Going out with friends. Using magic as of yesterday. Using less powerful magic as of always."