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The mug you use in the office says a lot about you, and this Build-on Brick Mug shows you’re creative and clever. That’s because it’s a fully customizable, extendable foundation, and right now, you can get it half off at just $19.99.

This unique mug has a peg-and-hole surface that lets you build upon it with toy construction blocks. The bricks are totally interchangeable, so you can feel free to put on as many or as few as you like. Get zany with a funky design, or show your practical side with a simpler, more functional layout. With four wheels included, you can even make it fully mobile to ride along your desk.

With the Build-on Brick Mug, you can have your coffee and play with it, too. You’re guaranteed to have the coolest mug in the office. Spice up your work day, and try out the Build-on Brick Mug while it’s only $19.99 — 50% off the regular price.