Software Developer Conference needs a shirt design - Lambda Jam

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This customer received 60 t-shirt designs from 14 designers. They chose this t-shirt design from db1404 as the winning design.
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T-shirt Design Brief
We need a shirt design for a software developer conference called "YOW! Lambda Jam 2016".
Based in Brisbane, the conference is specifically designed for Functional Programmers/Developers. This is the conference website: http://lambdajam.yowconference.com.au/
The attendees are predominately male, age 25-40. Smart, tech savvy. Non-mainstream stream people. They like to wear casual style clothing.
Why "YOW! Lambda Jam"?
* Functional Programming has its roots in the Lambda calculus.
* YOW! Lambda Jam is not your typical sitting and listening conference. A significant part of each day is devoted to hands-on practice (Jams) or workshops.
We are open to different style of final designs; our preference would be Fun, cartoon-like designs but we would also consider more corporate, clean and simple designs.
Either way, the final design should have clean lines, even if it's fun and cartoon-like we need to keep it lean with limited number of colours and elements.
Target Market(s)
The attendees are predominately male, age 25-40. Smart, tech savvy. Non-mainstream stream people. They like to wear casual style clothing.
Industry/Entity Type
Software
Look and feel
Each slider illustrates characteristics of the customer's brand and the style your logo design should communicate.
Elegant
Bold
Playful
Serious
Traditional
Modern
Personable
Professional
Feminine
Masculine
Colorful
Conservative
Economical
Upmarket
Requirements
Must have
- We are open to different style of final designs; our preference would be Fun, cartoon-like designs but we would also consider more corporate, clean and simple designs.
- Either way, the final design should have clean lines, even if it's fun and cartoon-like we need to keep lean and clean lines with limited number of colours and elements.
Nice to have
- Just for your information: Preferably the tee-shirts will be in dark colours (black or navy) or possibly white. However other shirts colours can be considered.