The small book consists of extracts from Kyle's blogs about animal rights vigils in Waikato and Whanganui. It covers her experiences and her feelings of anger and sadness as she "bears witness to animals going to slaughter". There is also a poem, and photographs.
The book was desktop published by Whanganui's Ella Grant, with 75 copies made. It cost about $1300 to make and most of that was donated by writer Alfred Pallas.
Kyle is giving away copies to politicians and others she would like to influence. She'll also sell them for $20 each. She's planning a larger second edition for supply to every library and secondary school in New Zealand.
One purpose of the book is to ask for mercy for animals. Another is to signal that change is coming.
"If we want to be on the right side of history we need to face the reality of an industry in its death throes, and begin to look at how we can transition to a more sustainable, more humane, economy."
The reasons for change are all over the internet, Kyle said. One is increased knowledge about animal intelligence. Another is the threat of global warming - agricultural emissions make up nearly half of New Zealand's contribution to global warming.
Another is the increasing billions of people in the world that have to be fed. At the same time, new technologies can produce "clean" meat from plants.
The change away from meat and dairy products will have huge repercussions for New Zealand, Kyle said. Procedures like artificial insemination, intensive confinement, dehorning, beak trimming and separating mothers and babies will end.
There will be fewer animals and more land used for crops, she said. Animals will live until they die a natural death, and people will still be able to enjoy them.
Vegan food is every bit as delicious as food from animals, according to Kyle, and it has versions of cheese, pavlova, mayonnaise and chocolate. She can even access vegan food for her pets.
Anyone who wants a copy of Glass Walls can email Kyle on sandrakyle22@gmail.com.