So after a bunch of discussions and comments, we have decided to update the t-shirt design. Instead of just the logo, it will also have the robot silhouette, white on black. See picture below. For those who have already purchased the shirt option, you'll get this automatically, For those who now want to switch to the shirt option, feel free to go ahead. And if you have a different option (like say the premium edition book), and you want to add a shirt to your order, please increase your pledge by $30 for US and $35 for International and send me a note letting me know you want a shirt added to your order, and I'll add you to the list. Thanks to Taylor for the suggestion!