Helena has adapted the door to our room to give it that ...cage effect.

Hmmm

I suspect that Helena's confused; she's supplied us with a length of electrical cabling and a length of fabric, neither of which we have touched. She thought that, because we've recently gnawed through the cables of her T.V. and telephone and chomped through her curtains, that our enthusiasm relates to cables and fabrics per se, but it doesn't, it's about happening across them - not being supplied them.
The excitement of 'finding' triggers the desire to 'gnaw'.