This is a ceramic mug depicting the TARDIS (Time And Relative Dimensions In Space) from the BBC's long-running Doctor Who television series. The exterior of the TARDIS resembles a blue police call-box, but the interior is a separate dimension that is much larger than the exterior.

Beeline Creative Inc. writes:

"It's Bigger on the Inside! Spice up your kitchen cabinets or collector shelves with the brand new line of Doctor Who Geeki Tikis® mugs. The Tardis Geeki Tikis® mug features the time machine and spacecraft’s signature blue police box styling with windows and decals as seen in the series. Each Geeki Tikis® mug features beautifully sculpted detailing true to the character it is paying homage to. Tardis is crafted from high-quality ceramic, holds 42oz. of your favorite beverage and is top-shelf dishwasher and microwave safe. Experience the aloha with every sip!"