Last weekend, The Brothers Brick attended the launch event for the LEGO Ideas 21315 Pop-Up Book in Portland, Oregon, and we chatted with fan designers Grant Davis and Jason Allemann about their collaboration and how the set became a reality.

Both Grant and Jason (aka JK Brickworks) are talented builders and have been featured on The Brothers Brick multiple times. If you haven’t yet, you should read our official review of the set (spoiler: we loved it) and then dive into this behind-the-scenes conversation about creating the set. LEGO Ideas 21315 Pop-Up Book is now available from LEGO for $69.99 US.

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The Brothers Brick: Thanks for chatting with us. We really enjoyed building and reviewing your LEGO Pop-Up Book. Can you tell us a little about how the collaboration first began?

Grant Davis: I had an idea for a LEGO pop-up book in late 2014. I created a model originally powered by LEGO rubber bands, but it was significantly more inconsistent than what I knew a set should be. I ended up contacting Jason because of the technical skill I had seen in his creations, and because he showed interest in my original model on Flickr when I posted it.

Grant’s first iteration of his LEGO Pop-Up Book using rubber bands and bendable minifigure legs.

Jason Allemann: Grant got in touch with me in February 2016 via a message on Flickr. I, of course, absolutely loved the original Pop-Up Book model he had posted over a year earlier, so when he asked if I wanted to join him to develop an Ideas project based on that concept, I jumped at the opportunity.

TBB: Had you two ever met each other prior to this collaboration?

Jason: I don’t think we’d ever met in person before the collaboration, but I was very familiar with Grant’s work via Flickr. I do recall he left a comment on my Particle Accelerator video on YouTube at some point, and I even gave him a shout out in one of my follow up videos for that model, all long before we started working on the Pop-Up Book.

Grant: The first time that we actually met was at Brickworld Chicago 2017 after the Ideas project had already launched and had 8,000-9,000 supporters. We both didn’t know that each other were going to be attending. It was pure coincidence that we ran into each other at the convention! We didn’t talk much about the project, but I do remember that we played some two-player arcade games together as our first in person bonding experience.

TBB: What was your collaboration process like?

Jason: We mostly shared info via e-mail and the occasional Skype call. What I remember most about the design period was that it just took a while. We were both pretty busy with other things, so it would often be weeks between development updates, and it took a full six months before we finally submitted the project. We are both easy going people, so working together was really nice, and we were on the same page with most of the design decisions.

Jason’s first prototype of the pop-up mechanism and an early idea for minifigure storage.

Grant: The bulk of the initial contact was done over email. We fleshed out a lot of the nitty gritty details there in long multi-point messages. We talked through how many inserts we should suggest in the project (we suggested two, which is what LEGO themselves decided to stick with). We set up a Google document to work on the exact description for the project as well, which helped lessen the amount of e-mails.

There was even a lengthy discussion on what exactly the project should be called. We talked through several title options for the project before settling on the simple title of “LEGO Pop-Up Book.” We at one point or another considered “Brick Adventures,” “Brick Tales,” and “Brick Worlds.” The “Once Upon a Brick” title that is on the final model of the book was thought up by the LEGO design team.

The first prototype of Grant and Jason’s LEGO Pop-Up Book submitted to LEGO Ideas.
Click to keep reading our interview with the fan designers of the LEGO Pop-Up Book