The clean-up operation hadn't quite gone according to plan. I'd successfully hosed Mochyn down, then soaped him up and scrubbed the worst of the mud off him. I'd even rinsed him off. He'd been squealing in indignation all the while though, and I'd counteracted his objection by singing 
Calon Lân very badly at him, with slightly modified lyrics...
 
"Mochyn lân, yn llawn daioni..." I sang at him, rather hopefully, not to mention loudly and out of tune, in case cleaning him up and making him less smelly (he really did smell rather awful...) might make him become a good pig and not steal my artichokes. 
"Gofyn wyf am fochyn hapus, mochyn onest, mochyn lân." It was one of my favourite songs, and I'd adopted it as a sort of love song as it's all about how a pure heart is more valuable than the riches of the world. Or, in my modified version, how a clean pig might become a good pig and not an artichoke thief.
 There had always been wild boar around the place, though they hadn't been too much of a problem 
since the fire and I'd become a bit lax about putting urine down along the boundaries to deter them. I hadn't expected to find one raiding my garden in broad daylight though! Cheeky thing.
 Washing him had NOT made him happy though! As I'd lathered him up for round two he'd made a final, successful bid for freedom and shot out of the shower-room like a greased pig leaving me with soap in my eyes and unable to see which way he'd gone. I presumed out of the front door, which I'd left open as my hands had been rather full dealing with a smelly bundle of fury as I'd removed him from his new mud pit. Which was supposed to be my vegetable garden! I shut the door, wiped the soap from my eyes, and decided I should take a shower myself as I hadn't exactly got the through the ordeal smelling of roses...
 As all the commotion died down, Rosa began to calm down a little and noticed all the springy things on the bed.
 
"What are they?" she asked, innocently.
 
"They are models of different wavelengths of light." Iggy explained. 
"Only they seem to be going in different directions, or something. We're trying to figure it out."
 Rosa looked at them, and picked them up and looked again from different directions.
 
"Oh well some of them are S-twist and some are Z-twist."
 "Pardon?" asked Iggy, who was quite bewildered that someone as young as Rosa and who wasn't exactly educated and in fact could barely even read would know something that sounded as intellectual as that.
 
"Look at those two brown ones - one twists one way and one twists the other!" she explained.
 
"I guess so..." Iggy agreed, going a bit cross-eyed as he studied them...
 
"It's a bit tricky to see with the springy things." Rosa admitted. 
"You can see right through them and it gets confusing because you end up not being able  to concentrate on the front slopey bits because you can still see the back ones..."
 "Hang on a minute, I've got an idea!" she announced, and hopped off the bed and scurried over to her stash of fleece.
 
 She grabbed a handful of white fleece, because she thought it would be easier to see the twist on white rather than black, and sprang back onto the bed. Though just before she jumped back up she thought she saw something hiding in the shadows under the bed. She put the idea out of her mind though as she wanted to demonstrate her spinning skills to the other dragons. It wasn't something they were usually interested in and it was nice to be able to share your interests and what you've been learning with your family.
 
"Look!" she said, as she took a pinch of the fleece and spun it in her fingers.
 
"You see - this is S-twist!"
 
 Iggy stared at Rosa's freshly spun yarn but wasn't quite sure he understood. Yet. So he went off to research S-twist and Z-twist on my laptop.
 Meanwhile Nigredo, my plushy raven, who tends to be drawn to shadows and those who lurk in them, also hopped down onto the floor and was peering under my bed.
 Iggy found this diagram, which explained in one glance what Rosa had been talking about.
 
 And then he took a closer look at Rosa's spun yarn and he began to be able to see the twist for himself. She was right - it was an S-twist!
 
 Iggy picked up the brown springy thing he'd made and had a look at it, but was a still a bit confusing. Then he had an idea. It might be easier to see the twist if he slid it back over the broom handle. Rosa hopped off the bed again to go and fetch it. She sniffed. There seemed to be a rather unpleasant smell emanating from under the bed. It probably needed sweeping or something. The broom mostly gets used for making springy things these days after all...
 She took the broom and helped Iggy slide his brown springy thing over the handle so it was easier to see the twist.
 
 Iggy stared and stared.
 Rosa sniffed. That smell seemed to be wafting up, and getting stronger by the minute. Nigredo braved the dust bunnies under my bed and went to investigate.
 
"I've got it!" declared Iggy. 
"It's a Z-twist! Look - if you imagine two lines drawn straight across the handle, one at the top of a twist and one at the bottom, it makes a Z shape!"
 
 Rosa, however, had lost interest as somebody under the bed was making rude noises.
 And she suspected it was Nigredo, the raven. Which led to a much more important question.
 
"Iggy," she asked, wrinkling her nose slightly. 
"Can birds fart?"