Architect's Studio Essentials - 10 objects + tools

Here's a peek inside a few of the personal effects and tools I use to run 30X40 each day. This is a sampling of my favorites, there are more of course, I'm interested to hear what makes your 'essentials' list.
Sources can be found here: http://thirtybyforty.com/architects-studio-essentials-10-objects-tools/

As presented in the video, they are:
1) Muji A5 dot
2) Pentel's Sign Pen (black + gray)
3) Bienfang 12" x 50 yd trace
4) Froebel blocks
5) Alvin 12"x18" self-healing cutting mat
6) OLFA L-2 + 18MM blades (the L-2 has the rubber handle, which is nice...)
7) C-THRU cork backed, stainless steel ruler (6"/12"/18"/24" lengths)
8) Guitar Strings (D'Addario Extra Heavy - Drop C tuning is my favorite as the gauges are heavier)
9) Gaffer's / Painter's tape
10) Canon pancake lenses - 24MM + 40MM provide great variety. NOTE: these are not zoom lenses, these are fixed focal lengths - that's important! Future video to describe why...

What are your favorites?

ALL MY GEAR (UPDATED LIST):
*http://thirtybyforty.com/kit

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Please watch: "Making a Site Model - The Outpost Project"
https://www.youtube.com/watch?v=VsJrDScS5ZI
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Видео Architect's Studio Essentials - 10 objects + tools канала 30X40 Design Workshop