Based on the "Tree of Creativity" located within the LEGO House in Billund, Denmark.
Sets are individually numbered out of 80 with sets 1-35 reserved for Inside Tour attendees and the remainder distributed to LEGO personnel involved with that particular tour. The numbering system is reused for each Inside Tour. The reverse of each tour's packaging includes a photo of that tour's attendees. Based on there being five tours in 2017, this set is limited to a total of 400 sets (80 in each packaging sleeve).
For the "Nonnie" BrickHeadz also presented as a gift to attendees of these tours, see set ITBH-1.
A second, slightly smaller variation of the "Tree of Creativity" with a production run of 10,000 sets and including fewer minifigures and fewer minibuilds on the tree was released exclusively at the LEGO House in Billund, Denmark in 2018 as set 4000026-1.