Celebrate in style with this unique black graphic tee! The shirt features a playful math equation that spells out a fun birthday message: '(HAP² + BIRTHDAY)!'. Above and below the message, there are several faint, complex mathematical formulas and diagrams in a contrasting color, giving the shirt an intellectual and whimsical appeal. Perfect for math enthusiasts or anyone with a sense of humor, this tee is a great way to show off your unique style on your birthday or any casual occasion. The comfortable fit and eye-catching design make it a standout piece in any wardrobe.